ChemInform Abstract: Regioselective Synthesis of Spiro-cyclopropanated 1-Aminopyrrol-2-ones by Bi(OTf)3-Catalyzed One-Pot “Mukaiyama—Michael Addition/Cyclization/Ring-Contraction” Reactions of 1,2-Bis(trimethylsilyloxy)cyclobutene with 1,2-Diaza-1,3-butadienes.

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