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51

A novel tetrahydrofuran derivative via a tertiary ketol-type rearrangement

Siegfried E. Drewes, Neville D. Emslie, John S. Field, Abdullah A. Khan, Niyum S. Ramesar

Journal:

Tetrahedron Letters

Year:

1993

Language:

english

File:

PDF, 177 KB

english, 1993

52

Novel dimeric chalcone-based pigments from Brackenridgea zanguebarica

Siegfried E. Drewes, Neale A. Hudson, Robert B. Bates, Gary S. Linz

Journal:

Tetrahedron Letters

Year:

1984

Language:

english

File:

PDF, 171 KB

english, 1984

53

A novel imidazolidin-2-one auxiliary for a highly stereoselective aldol route to β-hydroxyesters.

Siegfried E Drewes, Dean G.S. Malissar, Gregory H.P. Roos

Journal:

Tetrahedron: Asymmetry

Year:

1992

Language:

english

File:

PDF, 94 KB

english, 1992

54

Thein vitrometabolism of [8-14C]benzyladenine by excised organs of tomato plants

Arlene D. Bayley, Johannes Staden, Jennifer A. Mallett, Siegfried E. Drewes

Journal:

Plant Growth Regulation

Year:

1989

Language:

english

File:

PDF, 553 KB

english, 1989

55

Hypoglycaemic effect ofEriosema kraussianumN. E. Br. [Fabaceae] rootstock hydro-alcohol extract in rats

John A. O. Ojewole, Siegfried E. Drewes

Journal:

Journal of Natural Medicines

Year:

2007

Language:

english

File:

PDF, 189 KB

english, 2007

56

Determination of allantoin in Protea seed

Siegfried E. Drewes, Johannes van Staden

Journal:

Year:

1975

Language:

english

File:

PDF, 241 KB

english, 1975

57

Venusol from Gunnera perpensa: structural and activity studies

Fatima Khan, Xolani K. Peter, Rod.M. Mackenzie, Lynn Katsoulis, Ronette Gehring, Orde Q. Munro, Fanie R. van Heerden, Siegfried E. Drewes

Journal:

Year:

2004

Language:

english

File:

PDF, 162 KB

english, 2004

58

Knipholone from Bulbine latifolia and Bulbine frutescens

L.Frances van Staden, Siegfried E. Drewes

Journal:

Year:

1994

Language:

english

File:

PDF, 211 KB

english, 1994

59

Tolerability and Absorption Enhancement of Intranasally Administered Octreotide by Sodium Taurodihydrofusidate in Healthy Subjects

Thomas Kissel, Juergen Drewe, Siegfried Bantle, Andreas Rummelt, Christoph Beglinger

Journal:

Pharmaceutical Research

Year:

1992

File:

PDF, 1.15 MB

1992

60

Total synthesis of the pyranocoumaronochromone lupinalbin H

Mamoalosi A. Selepe, Siegfried E. Drewes, Fanie R. van Heerden

Journal:

Year:

2011

Language:

english

File:

PDF, 350 KB

english, 2011

61

Alkaloids from Crinum macowanii

Esameldin E Elgorashi, Siegfried.E Drewes, Johannes van Staden

Journal:

Biochemical Systematics and Ecology

Year:

2001

Language:

english

File:

PDF, 57 KB

english, 2001

62

Variation among three Crinum species in alkaloid content

Esameldin E. Elgorashi, Siegfried E. Drewes, Craig Morris, Johannes van Staden

Journal:

Biochemical Systematics and Ecology

Year:

2003

Language:

english

File:

PDF, 110 KB

english, 2003

63

Organ-to-organ and seasonal variation in alkaloids from Crinum macowanii

Esameldin E. Elgorashi, Siegfried E. Drewes, Johannes Van Staden

Journal:

Year:

2002

Language:

english

File:

PDF, 75 KB

english, 2002

64

Rate Enhancement Effects in the Dabco Catalysed Synthesis of Hydroxyalkenoate Esters

Ameer, Farouk, Drewes, Siegfried E., Freese, Susan, Kaye, Perry T.

Journal:

Synthetic Communications

Year:

1988

Language:

english

File:

PDF, 192 KB

english, 1988

65

Medicinal plants of Southern Africa. Part 1. Dimeric chalcone-based pigments from Brackenridgea zanguebarica

Drewes, Siegfried E., Hudson, Neale A., Bates, Robert B., Linz, Gary S.

Journal:

Journal of the Chemical Society Perkin Transactions 1

Year:

1987

Language:

english

File:

PDF, 645 KB

english, 1987

66

Reaction of 2-Formyl Imidazole with Intermediates From the Baylis-Hillman Reaction

Drewes, Siegfried E., Horn, Marion M., Ramesar, Niyum

Journal:

Synthetic Communications

Year:

2000

Language:

english

File:

PDF, 394 KB

english, 2000

67

Synthesis of Useful Intermediates from the Claisen-Rearrangement of α-Hydroxy Alkyl Acrylate Precursors

Drewes, Siegfried E., Emslie, Neville D., Karodia, Nazira, Loizou, Georgia

Journal:

Synthetic Communications

Year:

1990

Language:

english

File:

PDF, 255 KB

english, 1990

68

A New Route to Substituted Glutaric Acid Derivatives from Allylic Malonates

Mason, Paul H., Emslie, Neville D., Drewes, Siegfried E.

Journal:

Synthetic Communications

Year:

1995

Language:

english

File:

PDF, 297 KB

english, 1995

69

The chemical structures, plant origins, ethnobotany and biological activities of homoisoflavanones

du Toit, Karen, Drewes, Siegfried E., Bodenstein, Johannes

Journal:

Natural Product Research

Year:

2010

Language:

english

File:

PDF, 382 KB

english, 2010

70

2-Substituted 2-Propenoic Acid Esters via Reaction of a Masked Acrylate Ester with Carbonyl Compounds

Brand, Maja, Drewes, Siegfried E., Roos, Gregory H. P.

Journal:

Synthetic Communications

Year:

1986

Language:

english

File:

PDF, 230 KB

english, 1986

71

Gamma-Linolenic Acid Levels Correlate with Clinical Efficacy of Evening Primrose Oil in Patients with Atopic Dermatitis

Simon, Dagmar, Eng, Peter A., Borelli, Siegfried, Kägi, Roland, Zimmermann, Christian, Zahner, Catherine, Drewe, Jürgen, Hess, Lorenzo, Ferrari, Giovanni, Lautenschlager, Stephan, Wüthrich, Brunello,

Journal:

Advances in Therapy

Year:

2014

Language:

english

File:

PDF, 514 KB

english, 2014

72

Champagne met karnemelk

Simon, Dagmar, Eng, Peter A., Borelli, Siegfried, Kägi, Roland, Zimmermann, Christian, Zahner, Catherine, Drewe, Jürgen, Hess, Lorenzo, Ferrari, Giovanni, Lautenschlager, Stephan, Wüthrich, Brunello,

Journal:

Year:

2014

Language:

dutch

File:

PDF, 838 KB

dutch, 2014

73

Structural Changes of Zeatin During Acid Hydrolysis

van Staden, Johannes, Drewes, Siegfried E.

Journal:

Journal of Plant Physiology

Year:

1984

Language:

english

File:

PDF, 289 KB

english, 1984

74

Synthesis of 3-Hydroxy-2-Methylene Carbonyl Compounds - Effect of Catalyst and Substrate on Reaction Rate

Drewes, Siegfried E., Freese, Susan D., Emslie, Neville D., Roos, Gregory H. P.

Journal:

Synthetic Communications

Year:

1988

Language:

english

File:

PDF, 213 KB

english, 1988

75

A short synthesis of dl-epi-pyroangolensolide and dl-pyroangolensolide: confirmation of the structures of pyroangolensolide and calodendrolide

Drewes, Siegfried E., Grieco, Paul A., Huffman, John C.

Journal:

Journal of Organic Chemistry

Year:

1985

Language:

english

File:

PDF, 1.17 MB

english, 1985

76

Reaction of diazomethane with quaternary nitrogen compounds to form betaines

Drewes, Siegfried E., Magojo, Herbert E. M., Sutton, Donald A.

Journal:

Journal of the Chemical Society Perkin Transactions 1

Year:

1975

Language:

english

File:

PDF, 248 KB

english, 1975

77

Synthesis of new macrocycles. Part 5. Cyclization of 2,2?-dithiodibenzoic acid derivatives

Drewes, Siegfried E., Riphagen, Brian G.

Journal:

Journal of the Chemical Society Perkin Transactions 1

Year:

1976

Language:

english

File:

PDF, 311 KB

english, 1976

78

Synthesis of Three Phenolic Pent-1-EN-Ynes

Drewes, Siegfried E., Emslie, Neville D., Hemingway, Maxine

Journal:

Synthetic Communications

Year:

1990

Language:

english

File:

PDF, 290 KB

english, 1990

79

13C nuclear magnetic resonance spectra of the Senecio alkaloids, retrorsine, swazine, isoline, and hygrophylline

Drewes, Siegfried E., Antonowitz, Ivan, Kaye, Perry T., Coleman, Philip C.

Journal:

Journal of the Chemical Society Perkin Transactions 1

Year:

1981

Language:

english

File:

PDF, 307 KB

english, 1981

80

Reactivity and reactions of aromatic acetylenic acids and ketones

Drewes, Siegfried E., Douglass, Deborah, Malissar, Dean G. S., Roos, Gregory H. P., Kaye, Perry T.

Journal:

Journal of the Chemical Society Perkin Transactions 1

Year:

1990

Language:

english

File:

PDF, 577 KB

english, 1990

81

Synthesis of new macrocycles. Part II. Cyclic esters based on ???-dibromo-o-xylen

Drewes, Siegfried E., Riphagen, Brian G.

Journal:

Journal of the Chemical Society Perkin Transactions 1

Year:

1974

Language:

english

File:

PDF, 510 KB

english, 1974

82

Reactions of 1,2-diaminobenzene with 1,3-diketones

Drewes, Siegfried E., Upfold, Ursula J.

Journal:

Journal of the Chemical Society Perkin Transactions 1

Year:

1977

Language:

english

File:

PDF, 466 KB

english, 1977

83

Medicinal plants of southern Africa. Part 2. Synthesis of 1,3-bis-(4-methoxyphenyl)penta-1,4-diene, a stereoisomer of dimethylhinokiresinol, and its 4-monomethoxy analogue

Ameer, Farouk, Drewes, Siegfried E., Drewes, Mark W., Roos, Gregory H. P., Watson, Martin C.

Journal:

Journal of the Chemical Society Perkin Transactions 1

Year:

1988

Language:

english

File:

PDF, 654 KB

english, 1988

84

Experimental and theoretical studies of a naturally occurring non-oligomeric steroidal supramolecular zipper

Munro, Orde Q., du Toit, Karen, Drewes, Siegfried E., Crouch, Neil R., Mulholland, Dulcie A.

Journal:

New Journal of Chemistry

Year:

2006

Language:

english

File:

PDF, 1.12 MB

english, 2006

85

Synthesis of new macrocycles. Part 6. Pyridine-retronecate, a new synthetic alkaloid

Drewes, Siegfried E., Pitchford, Andrew T.

Journal:

Journal of the Chemical Society Perkin Transactions 1

Year:

1981

Language:

english

File:

PDF, 501 KB

english, 1981

86

Intramolecular Baylis-Hillman Reaction: A Pathway to Substituted Coumarins

Drewes, Siegfried E., Njamela, Owen L., Emslie, Neville D., Ramesar, Niyum, Field, John S.

Journal:

Synthetic Communications

Year:

1993

Language:

english

File:

PDF, 245 KB

english, 1993

87

Asymmetric Synthesis of 2-Substituted Acrylate Esters

Brand, Maja, Drewes, Siegfried E., Loizou, Georgia, Roos, Gregory H.P.

Journal:

Synthetic Communications

Year:

1987

Language:

english

File:

PDF, 265 KB

english, 1987

88

2-Formylimidazole as Substrate in Baylis-Hillman Reactions: Synthesis of a β-Substituted Acrylate

Drewes, Siegfried E., Rohwer, Mark B.

Journal:

Synthetic Communications

Year:

1997

Language:

english

File:

PDF, 303 KB

english, 1997

89

A Facile, Efficient Route to Methyl α-Hydroxymethylacrylate and Methyl α-Halomethylacrylates

Drewes, Siegfried E., Loizou, Georgia, Roos, Gregory H. P.

Journal:

Synthetic Communications

Year:

1987

Language:

english

File:

PDF, 216 KB

english, 1987

90

Medicinal plants of Southern Africa. Part 4. Synthesis of brackenin-like molecules from 1,4-dicarbonyl precursors and by oxidative coupling. X-Ray molecular structure of racemic-2,3-dibenzyl-1,4-diphenylbutane-1,4-dione

Drewes, Siegfried E., Hogan, Craig J., Kaye, Perry T., Roos, Gregory H. P.

Journal:

Journal of the Chemical Society Perkin Transactions 1

Year:

1989

Language:

english

File:

PDF, 915 KB

english, 1989

91

A One Pot Synthesis of 2-Benzyl -1,3,5-Triphenylpentan-1,5-Dione

Drewes, Siegfried E., Hogan, Craig J., Kaye, Perry T.

Journal:

Synthetic Communications

Year:

1987

Language:

english

File:

PDF, 208 KB

english, 1987

92

Furan Derivatives from Cyclodehydratign of Brackein-Like 1,4-Dicarbonyl Compounds

Drewes, Siegfried E., Hogan, Craig J.

Journal:

Synthetic Communications

Year:

1989

Language:

english

File:

PDF, 217 KB

english, 1989

93

Synthesis of Chiral α-Hydroxyphenyl Crotonates

Brand, Maja, Drewes, Siegfried E., Emslie, Neville D., Khan, Abdullah A.

Journal:

Synthetic Communications

Year:

1991

Language:

english

File:

PDF, 196 KB

english, 1991

94

(-)-8-Phenylmenthyl Acrylate as Chiral Inducer in the Baylis-Hillman Reaction

Drewes, Siegfried E., Emslie, Neville D., Khan, Abdullah A.

Journal:

Synthetic Communications

Year:

1993

Language:

english

File:

PDF, 406 KB

english, 1993

95

Chiral, Cyclic Amino Aldehydes in the Baylis-Hillman Reaction – A Route to Sphingosine Analogues

Drewes, Siegfried E., Khan, Abdullah A., Rowland, Karen

Journal:

Synthetic Communications

Year:

1993

Language:

english

File:

PDF, 211 KB

english, 1993

96

Reactivity of Pent-1-EN-4-Ynes and Synthesis of 2-Substituted Derivatives

Drewes, Siegfried E., Slater-kinghorn, Barbara J.

Journal:

Synthetic Communications

Year:

1986

Language:

english

File:

PDF, 220 KB

english, 1986

97

Necic acid synthons. Part 2. Regioselectivity in the reactions of Z-2-bromomethyl-2-alkenoate esters with selected carbon nucleophiles

Ameer, Farouk, Drewes, Siegfried E., Emslie, Neville D., Kaye, Perry T., Mann, R. Leigh

Journal:

Journal of the Chemical Society Perkin Transactions 1

Year:

1983

Language:

english

File:

PDF, 346 KB

english, 1983

98

Preparation of a Crystalline Tris-( N -methylpyridinium)-Derivative of Bovine Insulin

DREWES, Siegfried E., SUTTON, Donald A.

Journal:

Hoppe-Seyler's Zeitschrift für physiologische Chemie

Year:

1976

Language:

english

File:

PDF, 710 KB

english, 1976

99

Crystalline [A21-Desamido] Bovine Insulin

EASTER, Barratt R. D., SUTTON, Donald A., DREWES, Siegfried E.

Journal:

Hoppe-Seyler's Zeitschrift für physiologische Chemie

Year:

1978

Language:

english

File:

PDF, 1.09 MB

english, 1978

100

A Crystalline A14-(2-Nitro-4-trimethylammoniophenyl) Derivative of Bovine Insulin

EASTER, Barratt R. D., DREWES, Siegfried E.

Journal:

Hoppe-Seyler's Zeitschrift für physiologische Chemie

Year:

1979

Language:

english

File:

PDF, 927 KB

english, 1979