Photochemical Synthesis of Prochiral Dialkyl 3, 3??Dialkylcyclopropene??1, 2??dicarboxylates with Facial Shielding Substituents and Related Substrates

…, AR Nass, F Naumann, JW Bats, M Bolte

Index: Hashmi, A. Stephen K.; Grundl, Marc A.; Nass, Andreas Rivas; Naumann, Frank; Bats, Jan W.; Bolte, Michael European Journal of Organic Chemistry, 2001 , # 24 p. 4705 - 4732

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Citation Number: 11

Abstract

Abstract Different types of cyclopropene-1, 2-dicarboxylates 1 have been obtained by photochemical methods from the corresponding pyrazoles 11, 12, or 13. These pyrazoles were synthesized by 1, 3-dipolar cycloadditions of alkynes 8 or 9 with either preformed diazoalkanes or diazoalkanes generated photochemically in situ, by use of oxadiazolines as diazoalkane precursors. The numerous substrates have clearly established the scope and ...