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1

Carbon-carbon bond formation and annulation reactions using trimethyl and triethyl orthoformates

Subrata Ghosh, Usha Ranjan Ghatak

Journal:

Journal of Chemical Sciences

Year:

1988

Language:

english

File:

PDF, 732 KB

english, 1988

2

ChemInform Abstract: Synthetic Studies Towards Complex Diterpenoids. Part 20. Total Synthesis of the Linear Abietane o-Quinone Umbrosone.

Keya Ghosh, Usha Ranjan Ghatak

Journal:

Year:

1999

File:

PDF, 25 KB

1999

3

Influence of methoxy-and methyl-aromatic substituents on stereochemistry of the products in the acid-catalyzed cyclization of 2-(2-arylethyl)-1,3,3-trimethylcyclohexanols: stereocontrolled total synthesis of (±)-nimbidiol and (±)-nimbiol

Bimal K. Banik, Sukumar Ghosh, Usha Ranjan Ghatak

Journal:

Year:

1988

Language:

english

File:

PDF, 723 KB

english, 1988

4

Condensed cyclic and bridged-ring systems : part 12: A novel synthetic route to 4-p-methoxyphenyl-bicyclo[ 2.2.2 ]octan-2-ones and some bicyclo [ 3.2.1 ] octane derivatives by acid-catalyzed intramolecula

Ratna Dasgupta, Pranab R. Kanjilal, Swapan K. Patra, Manish Sarkar, Usha Ranjan Ghatak

Journal:

Year:

1985

Language:

english

File:

PDF, 665 KB

english, 1985

5

A simple synthesis of α, β-unsaturated aldehydes by 1,3-carbonyl transposition through one carbon homologation

Ratna Dasgupta, Usha Ranjan Ghatak

Journal:

Tetrahedron Letters

Year:

1985

Language:

english

File:

PDF, 215 KB

english, 1985

6

Synthetic studies towards complex diterpenoids. Part 18. Total synthesis of (�)-isopisiferin and the related compounds

Deb, Soumitra, Bhattacharjee, Gopa, Ghatak, Usha Ranjan

Journal:

Journal of the Chemical Society Perkin Transactions 1

Year:

1990

Language:

english

File:

PDF, 826 KB

english, 1990

7

Highly regioselective 8-endo-aryl radical cyclisation: a new synthetic route to decahydrodibenzo-[a,d]- and -[a,e]-cyclooctenols

Ghosh, Keya, Ghosh, Ajit K., Ghatak, Usha Ranjan

Journal:

Journal of the Chemical Society Chemical Communications

Year:

1994

Language:

english

File:

PDF, 238 KB

english, 1994

8

ChemInform Abstract: TOTALSYNTH. VON (+-)-O-METHYL-14-METHYL-ISODOCARPSAEURE

GHATAK, USHA RANJAN, CHATTERJEE, NITHAR RANJAN

Journal:

Chemischer Informationsdienst. Organische Chemie

Year:

1971

File:

PDF, 252 KB

1971

9

Condensed cyclic and bridged-ring systems-14. stnthesis of some bridged propano-hydrophenanthrene, -hydrofluorene and polycyclic benzo-propellane derivatives through intramolecular c-alkylations of γ δ-unsaturated α'-diazomethyl ketones

Chhanda Ray, Bijali Saha (in part), Usha Ranjan Ghatak

Journal:

Year:

1990

Language:

english

File:

PDF, 1.16 MB

english, 1990

10

Alkali metal-liquid ammonia reduction of γ-lactones to diols and cyclic hemiacetals: stereochemical influence by the neighbouring group on the nature

Asit K. Chkraborty, Bijali Saha, Chhanda Ray, Usha Ranjan Ghatak

Journal:

Year:

1987

Language:

english

File:

PDF, 431 KB

english, 1987

11

A facile synthetic route to complex polycyclic natural products through intramolecular alkylation with α-diazomethyl ketones

Subrata Ghosh, Usha Ranjan Ghatak

Journal:

Journal of Chemical Sciences

Year:

1984

Language:

english

File:

PDF, 803 KB

english, 1984

12

Synthetic studies towards complex diterpenoids. Part 19. Total synthesis of (�)-deoxofaveline, (�)-faveline methyl ether and (�)-faveline

Ghosh, Ajit K., Mukhopadhyay (n�e Ray), Chhanda, Ghatak, Usha Ranjan

Journal:

Journal of the Chemical Society Perkin Transactions 1

Year:

1994

Language:

english

File:

PDF, 804 KB

english, 1994

13

A formylation-cyclization method of synthesis of cycloalkenones from unsaturated ketones. 2. Simple synthesis of some functionalized bicyclo[3.3.1]nonane derivatives

Chakraborti, Ratna, Ranu, Brindaban C., Ghatak, Usha Ranjan

Journal:

Journal of Organic Chemistry

Year:

1985

Language:

english

File:

PDF, 568 KB

english, 1985

14

Acid-catalyzed intramolecular C-alkylation in .beta.,.gamma.-unsaturated diazomethyl ketones. 3. A simple synthetic route to hexahydro-4,9a-ethano-1H-fluoren-11-ones, hexahydro-6H-pentaleno[6a,1-a]indan-4-ones and hexahydrocyclobuta[j]fluoren-2(1H)-ones

Roy, Subhas C., Satyanarayana, Gutta O. S. V., Ghatak, Usha Ranjan

Journal:

Journal of Organic Chemistry

Year:

1982

Language:

english

File:

PDF, 1.15 MB

english, 1982

15

Condensed cyclic and bridged-ring systems. 8. Factors influencing the stereochemistry of the products in the acid-catalyzed cycloalkylation reactions of some substituted .beta.-phenylethylcyclohexene and -cyclohexanol derivatives

Ghatak, Usha Ranjan, Chatterjee, Nithar Ranjan, Sanyal, Baijayanti

Journal:

Journal of Organic Chemistry

Year:

1979

Language:

english

File:

PDF, 1.09 MB

english, 1979

16

ChemInform Abstract: Stereoselective Intramolecular 6-exo-Heck Reaction: A Facile Synthetic Route to Podocarpa-8,11,13-triene and Diterpenoid Resin Acids Intermediates.

Jayanta K. Mukhopadhyaya, Ajit K. Ghosh, Usha Ranjan Ghatak

Journal:

Year:

1999

File:

PDF, 32 KB

1999

17

Synthetic studies toward complex diterpenoids. 10. Stereocontrolled total synthesis of (.+-.)-19.alpha.,20.alpha.-(acetylimino)-12-hydroxy-5.beta.,10.alpha.-podocarpa-8,11,13-triene, a degradation product of atisine

Ghatak, Usha Ranjan, Alam, Shaikh Khairul, Ray, Jayanta K.

Journal:

Journal of Organic Chemistry

Year:

1978

Language:

english

File:

PDF, 1.03 MB

english, 1978

18

Acid-catalyzed intramolecular C-alkylation in .beta.,.gamma.-unsaturated diazomethyl ketones. 2. A simple new synthetic route to octahydro-4,10a-ethanophenanthren-12-ones and octahydropentaleno[6a,1-a]naphthalen-4-ones

Satyanarayana, Gutta O. S. V., Roy, Subhas C., Ghatak, Usha Ranjan

Journal:

Journal of Organic Chemistry

Year:

1982

Language:

english

File:

PDF, 1.80 MB

english, 1982

19

A total synthesis of (�)-O-methyl-14-methylpodocarpic acid

Ghatak, Usha Ranjan, Chatterjee, Nithar Ranjan

Journal:

Journal of the Chemical Society C Organic

Year:

1971

Language:

english

File:

PDF, 1023 KB

english, 1971

20

A Facile Synthetic Route to 1,1-Disubstituted 2,3-Dihydro-1 H -benz[ f ]indene-4,9-diones

Pal, Sitaram, Banik, Bimal K., Ghatak, Usha Ranjan

Journal:

Year:

1992

File:

PDF, 245 KB

1992

21

Regioselectivity in the intramolecular carbon?hydrogen insertion in metal-catalysed decomposition of some cis-1-methyl-3-arylcyclohexyl diazomethyl ketones. A highly efficient homogeneous nickel catalyst for carbenoid insertion

Chakraborti, Asit K., Ray, Jayanta K., Kundu, Kalyan K., Chakrabarty, Sephali, Mukherjee, Debabrata, Ghatak, Usha Ranjan

Journal:

Journal of the Chemical Society Perkin Transactions 1

Year:

1984

Language:

english

File:

PDF, 1.81 MB

english, 1984

22

Synthesis of Some Angularly Cyclopentanone Fused Hydrophenanthrene and Hydrofluorene Derivatives by Acid-Catalyzed Intramolecular C-Alkylation of γ,δ - Unsaturated α′-Diazomethyl Ketones

Ray, Chhanda, Saha, Bijali, Ghatak, Usha Ranjan

Journal:

Synthetic Communications

Year:

1991

Language:

english

File:

PDF, 619 KB

english, 1991

23

Synthesis of Condensed Cyclic Systems. I. 1 New Synthesis of 7-Methylbicyclo-[3.3.0]octan-3-one and 8-Methylbicyclo[4.3.0]nonan-4-one

SEN, KALYANMAY, GHATAK, USHA RANJAN

Journal:

Journal of Organic Chemistry

Year:

1959

Language:

english

File:

PDF, 523 KB

english, 1959

24

Influence of electron donating aromatic substituents on the ruthenium tetroxide-catalysed oxidation of (±)-podocarpa-8,11,13-trienes

Sukumar Ghosh, Usha Ranjan Ghatak

Journal:

Year:

1992

Language:

english

File:

PDF, 583 KB

english, 1992

25

Influence of electron donating aromatic substituents on the stereochemistry of the products in cycloalkylations of 2-(2-arylethyl)-3,3-dimethyl-1-methylenecyclohexane and related substrates: mechanisms of aromatic cycloalkylations

Ghosh, Sukumar, Banik, Bimal K., Ghatak, Usha Ranjan

Journal:

Journal of the Chemical Society Perkin Transactions 1

Year:

1991

Language:

english

File:

PDF, 690 KB

english, 1991

26

Synthetic studies toward complex diterpenoids. 16. A novel synthetic route to the carbocyclic skeleta of stemodin and stemarin by acid-catalyzed intramolecular C-alkylation and rearrangement reactions

Kanjilal, Pranab R., Sarkar, Manish, Patra, Swapan K., Ghosh, Subrata, Ghatak, Usha Ranjan

Journal:

Journal of Organic Chemistry

Year:

1985

Language:

english

File:

PDF, 994 KB

english, 1985

27

Condensed cyclic and bridged-ring systems. Part 13. Synthesis of the insect attractant hydrocarbon, 9a-carbamorphinan, and X-ray structural analyses of 9a-carbamorphinan-10-one and 9a-carba-14?-morphinan-10-one

Chakraborti, Asit K., Alam, Shaikh Khairul, Chakraborti, Prabir C., Dasgupta, Rupak, Chakravarty, Jyotirmoy, Ghatak, Usha Ranjan, Kabiraj, Apurba, Biswas, Sundar Gopal

Journal:

Journal of the Chemical Society Perkin Transactions 1

Year:

1986

Language:

english

File:

PDF, 723 KB

english, 1986

28

Regioselective aryl radical cyclisation. Part 2.1 Synthesis of octahydro-1H-dibenzo[a,d]cycloheptenes through 7-endo ring closure

Ghosh, Ajit K., Mukhopadhyaya, Jayanta K., Ghatak, Usha Ranjan

Journal:

Journal of the Chemical Society Perkin Transactions 1

Year:

1997

Language:

english

File:

PDF, 128 KB

english, 1997

29

Synthetic Studies on Resin Acids. IV 1

Ghatak, Usha Ranjan, Datta, Dilip Kumar, Ray, Suvas Chandra

Journal:

Journal of the American Chemical Society

Year:

1960

Language:

english

File:

PDF, 962 KB

english, 1960

30

Regioselective Aryl Radical Cyclization. 1. Stereocontrolled Synthesis of Linearly Condensed Hydroaromatic Carbocyclic Systems through 6-endo-Ring Closures

Pal, Sitaram, Mukhopadhyaya, Jayanta K., Ghatak, Usha Ranjan

Journal:

Journal of Organic Chemistry

Year:

1994

Language:

english

File:

PDF, 1.06 MB

english, 1994

31

Synthetic studies towards complex diterpenoids. Part 20.1 Total synthesis of the linear abietane o-quinone umbrosone

Ghosh, Keya, Ghatak, Usha Ranjan

Journal:

Journal of the Chemical Society Perkin Transactions 1

Year:

1999

Language:

english

File:

PDF, 139 KB

english, 1999

32

An Efficient Palladium Catalyzed Stereocontrolled Synthesis of 4a-Angular Methyl Substituted Hydrofluorenes

Mukhopadhyaya, Jayanta K., Pal, Sitaram, Ghatak, Usha Ranjan

Journal:

Synthetic Communications

Year:

1995

Language:

english

File:

PDF, 445 KB

english, 1995

33

-Methox Ybenzyloctalins

Pal, Sitaram, Ghosh, Sukumar, Banik, Bimal K., Alam, Shaikh Khairul, Ghatak, Usha Ranjan

Journal:

Synthetic Communications

Year:

1990

Language:

english

File:

PDF, 539 KB

english, 1990

34

ChemInform Abstract: A Novel Route to Functionalized Linearly Benzannulated Cycloheptene and Cyclooctene Derivatives Through Regioselective Aryl Radical Cyclization.

Jayanta K. Mukhopadhyaya, Sitaram Pal, Usha Ranjan Ghatak

Journal:

Year:

1999

File:

PDF, 29 KB

1999

35

A highly effective ligand-bound ruthenium catalyst for chemoselective degradation of aromatic rings to carboxylic acids

Chakraborti, Asit K., Ghatak, Usha Ranjan

Journal:

Journal of the Chemical Society Perkin Transactions 1

Year:

1985

Language:

english

File:

PDF, 642 KB

english, 1985

36

Synthetic studies toward complex diterpenoids. Stereocontrolled total synthesis of some gibbane synthons and degradation products of gibberellins

Ghatak, Usha Ranjan, Chakraborti, Prabir C.

Journal:

Journal of Organic Chemistry

Year:

1979

Language:

english

File:

PDF, 743 KB

english, 1979

37

-6-Aryl-2-Oxobicyclo [3.3.1]Nonanes

Chakraborti, Ratna, Ranu, Brindaban C., Ghatak, Usha Ranjan

Journal:

Synthetic Communications

Year:

1987

Language:

english

File:

PDF, 192 KB

english, 1987

38

An Expeditious Total Synthesis of (±)-Sempervirol, (±)-Sugiol and (±)-Xanthopherol Methyl Ether by Acid-Catalyzed Cyclialkylation Route

Banik, Bimal K., Ghatak, Usha Ranjan

Journal:

Synthetic Communications

Year:

1989

Language:

english

File:

PDF, 581 KB

english, 1989

39

A novel synthetic method for angularly functionalized polycyclic systems by vinylogous wolff rearrangement of β, γ-unsaturated diazoketones

Bijali Saha, Gopa Bhattacharjee, Usha Ranjan Ghatak

Journal:

Tetrahedron Letters

Year:

1986

Language:

english

File:

PDF, 168 KB

english, 1986

40

Stereochemistry of desoxypodocarpic acid isomers

Usha Ranjan Ghatak

Journal:

Tetrahedron Letters

Year:

1959

Language:

english

File:

PDF, 229 KB

english, 1959

41

An Expeditious Stereoselective Total Synthesis of (±)-Podocarpa-2,8,11.13-Tetraene and 3-Oxygenated (±)-Podocarpa-8,11,13-Trienes by Acid-Catalyzed Cyclialkylation Route

Ghosh, Sukumar, Ghosh, Ajit K., Ghatak, Usha Ranjan

Journal:

Synthetic Communications

Year:

1992

Language:

english

File:

PDF, 415 KB

english, 1992

42

Novel synthetic route to angularly functionalized hydrofluorene derivatives by a regio- and stereospecific metalation-carbonation reaction

Ghosh, Subrata, Ghatak, Usha Ranjan

Journal:

Journal of Organic Chemistry

Year:

1981

Language:

english

File:

PDF, 673 KB

english, 1981

43

A highly regioselective 6-endo-aryl radical cyclisation: stereocontrolled synthesis of trans-octahydroanthracenes

Pal, Sitaram, Mukherjee, Monika, Podder, Debi, Mukherjee, Alok K., Ghatak, Usha Ranjan

Journal:

Journal of the Chemical Society Chemical Communications

Year:

1991

Language:

english

File:

PDF, 276 KB

english, 1991

44

First total synthesis of the novel cytotoxic benzocycloheptenes (±)-deoxofaveline and (±)-faveline methyl ether

Ajit K. Ghosh, Chhanda Ray, Usha Ranjan Ghatak

Journal:

Tetrahedron Letters

Year:

1992

Language:

english

File:

PDF, 199 KB

english, 1992

45

Condensed cyclic and bridged-ring systems. Part 15. Acid-catalysed intramolecular alkylations in 1-diazoacetyl-1,2,3,4-tetrahydro-9-methoxy-1-methylphenanthrenes

Pal, Sitaram, Banik, Bimal K., Ghatak, Usha Ranjan

Journal:

Journal of the Chemical Society Perkin Transactions 1

Year:

1994

Language:

english

File:

PDF, 811 KB

english, 1994

46

Synthetic studies towards complex diterpenoids. Part 11. Stereochemically defined synthesis of the racemates of 1,2,3,4,4a,9a-hexahydro-7-methoxy-1-methylfluorene-1-carboxylic acid

Ghosh, Subrata, Dasgupta, Rupak, Chakravarty, Jyotirmoy, Ghatak, Usha Ranjan

Journal:

Journal of the Chemical Society Perkin Transactions 1

Year:

1980

Language:

english

File:

PDF, 500 KB

english, 1980

47

Extension of an Improved Procedure for the Ruthenium Tetroxide-Catalyzed Degradation of Aromatic Rings: A Highly Efficient and Stereocontrolled Synthesis of Functionalized Bridged-Ring and Carbocyclic Esters

Chakraborti, Asit K., Ghatak, Usha Ranjan

Journal:

Year:

1983

File:

PDF, 166 KB

1983

48

ChemInform Abstract: TOTALSYNTH. VON (+-)-O-METHYL-14-METHYL-ISODOCARPSAEURE

GHATAK, USHA RANJAN, CHATTERJEE, NITHAR RANJAN

Journal:

Chemischer Informationsdienst. Organische Chemie

Year:

1971

Language:

german

File:

PDF, 252 KB

german, 1971

49

Vinylogous Wolff rearrangement of cyclic ?,?-unsaturated diazomethyl ketones: a new synthetic method for angularly functionalised polycyclic systems

Saha, Bijali, Bhattacharjee, Gopa, Ghatak, Usha Ranjan

Journal:

Journal of the Chemical Society Perkin Transactions 1

Year:

1988

Language:

english

File:

PDF, 792 KB

english, 1988

50

Acid-catalysed intramolecular C-alkylation in ?,?-unsaturated diazomethyl ketones. Part 4. Synthesis of functionalised hydrophenanthrene and benzocyclodecenone derivatives via novel fragmentation reactions, and X-ray structural analyses of two angularly substituted hydrophenanthrene derivatives

Saha, Bijali, Roy, Subhas C., Satyanarayana, Gutta O. S. V., Ghatak, Usha Ranjan, Seal, Alpana, Ray, Siddhartha, Bandyopadhyay, Ramrenu, Ghosh, Minakshi, Das, Birendranath, Basak, Bijoy S.

Journal:

Journal of the Chemical Society Perkin Transactions 1

Year:

1985

Language:

english

File:

PDF, 1.23 MB

english, 1985

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