An asymmetric synthesis of 4,4- and 6,6-dialkylcyclohexenones and 4,4- and 5,5-dialkylcyclopentenones. Application to the total synthesis of (-)-silphiperfol-6-ene
作者:A.I. Meyers、Bruce A. Lefker
DOI:10.1016/s0040-4020(01)87745-0
日期:1987.1
Chiral amino alcohols have been transformed into bicycliclactams 1 and 6 which, after metalation and alkylation, gave high diastereomeric ratios of 2,2-dialkyl quaternary products, 29 and 12, respectively. Addition of organolithium reagents to the carbonyl of these lactams, followed by acidic cleavage, leads to enantiomericallypure cyclohex-2-enones and cyclopent-2-enones. This process was also applied