Synthesis of γ-lactones from intermediate 2-(γ-hydroxyacyl)-imidazoles by N-methylation and base-catalyzed C C bond cleavage. Application to the synthesis of (±)- cavernosine
作者:D.Huw Davies、Nicholas A. Haire、Jonathan Hall、Edward H. Smith
DOI:10.1016/s0040-4020(01)80461-0
日期:1992.1
Reaction of the allyl anions of 0-trialkylsilyl-N-alkyl-2-(1'-hydroxyprop-2'-enyl)imidazoles with aldehydes and ketones gives products of alpha- and gamma-attack. Greater steric hindrance in the anion (triisopropylsilyl VS t-butyldimethylsilyl) and in the aldehyde or ketone favours the gamma-products. Sequential desilylation, N-methylation and treatment with base resulted in cleavage of these products to gamma-lactones. The method was applied to the synthesis of (+/-)-cavernosine.
DAVIES, D. HUW;HALL, JONATHAN;SMITH, EBWARD H., J. CHEM. SOC. PERKIN TRANS. PT 1,(1989) N, C. 837-838
作者:DAVIES, D. HUW、HALL, JONATHAN、SMITH, EBWARD H.
DOI:——
日期:——
Davies, D. Huw; Hall, Jonathan; Smith, Edward H., Journal of the Chemical Society. Perkin transactions I, 1989, p. 837 - 838