Reactions of methylvinyl and phenylvinyl ketones with a tricyclic ketone derived from 2-tetralone: characterisation of crystalline products by x-ray diffraction.
作者:Christine J. Cardin、Mary S. Carson、Wesley Cocker、Deborah J. Wilcock、Patrick V.R. Shannon
DOI:10.1016/s0040-4020(01)87225-2
日期:1993.8
Base catalysed reaction of the tricyclic ketone (6 ⇌ 7) with methylvinyl ketone gave the tetracyclic ketols, 11, 13, 15, 16, and the pentacyclic ketols, 12, 17. With phenylvinyl ketone, the tetracyclic ketol (18) was formed. The stereostructures of the ketols were identified by X-Ray diffraction.
Synthesis of conformationally restricted relatives of the mevinic acids
作者:Frank Bennett、Garry Fenton、David W. Knight
DOI:10.1016/s0040-4020(01)90425-9
日期:1994.4
Condensations between the tricyclic ketones 9, 19 and 23 and the sodio-lithio dianion of methyl acetoacetate Lead to the conformationally restricted Mevinic acid relatives 12b, 20b and 26 respectively, following lactonization and selective reduction. The approach of the nucleophile is stereospecific in the first two instances but not in the last; explanations for this behaviour are given. The target compounds showed negligible HMGCoA reductase antagonism.
Factors involved in photoinduced n,.pi.* singlet isomerizations of cyclic .beta.,.gamma.-unsaturated ketones