(R)-2,3-Cyclohexylideneglyceraldehyde, a novel template for facile and simple entry into chiral hydroxy γ-lactones: synthesis of (−)-muricatacin
摘要:
(R)-2,3-Cyclohexylideneglyceraldehyde 1 has been used in a simple and efficient synthesis of (-)-muricatacin 10. The required chiron, syn-alkanetriol 2a was prepared by the reduction of a ketone 3 derived from 1. (c) 2005 Elsevier Ltd. All rights reserved.
Diastereoselective Synthesis ofsyn-Alkanetriols from a Glyceral Derivative viak-Selectride Reduction: Application to the Synthesis of a Pheromone of the Sugarcane Weevils
Metal-Dependent Reaction Tuning with Cyclopentylmetal Reagents: Application to the Asymmetric Synthesis of (+)-α-Conhydrine and (<i>S</i>)-2-Cyclopentyl-2-phenylglycolic Acid
The reaction of halocyclopentane organometallic reagents can be tuned by the choice of metal (see scheme). Cyclopentylmagnesium bromide reduces aldehydes and ketones to the corresponding alcohols. However, in the presence of ZnCl2, normal Grignardaddition to the ketones gives tertiary alcohols with complete diastereoselectivity. These protocols were used in the asymmetric synthesis of two medicinally