Decarboxylative Photocyclization: Synthesis of Benzopyrrolizidines and Macrocyclic Lactones
作者:Axel G. Griesbeck、Frank Nerowski、Johann Lex
DOI:10.1021/jo990390b
日期:1999.7.1
enantiomerically pure γ-amino acid derivatives 1, 5a, and 5b by decarboxylative photocyclization of the corresponding potassium salts in aqueous acetone. The diastereoselectivity of the radical coupling step was low (dr = 60:40) for the N-phthaloylglutamic acid methyl ester 1, whereas the α-benzyl- and the α-methyl-substituted γ-phthalimido butyric acid derivatives 5a,b cyclized with high cis diastereoselectivity