C2-symmetric enantiopure ethanotethered bis(α,β-butenolides) as templates for asymmetric synthesis. Application to the synthesis of (+)-grandisol

Pedro De March, Marta Figueredo, Josep Font, Javier Raya, Angel Alvarez-Larena, Juan F. Piniella

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46 Citations (Scopus)

Abstract

Starting from D-mannitol, we have prepared several C2-symmetric ethanotethered bis(α,βbutenolides) and studied their [2+2] photocycloaddition reaction with ethylene. The protective groups of the central diol unit have a noticeable influence on the facial selectivity of the cycloaddition, the bis(trimethylsilyloxy) derivatives showing the highest diastereoselectivity. A theoretical conformational analysis of the substrates in the ground state is in good agreement with the diastereofacial selectivity experimentally observed. The bis(photocycloadducts) have been converted into the enantiopure cyclobutanes formally derived from the photoreaction of ethylene with γ-0hydroxymethylα,β-butenolide, in which only a moderate facial selectivity had been previously found. As an application of these studies, we have developed a highly efficient and stereoselective synthesis of (+)-grandisol.
Original languageEnglish
Pages (from-to)2437-2447
JournalJournal of Organic Chemistry
Volume68
Issue number6
DOIs
Publication statusPublished - 21 Mar 2003

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