Highly Efficient, Enantioselective Synthesis of (+)-Grandisol from a <i>C</i><sub>2</sub>-Symmetric Bis(α,β-butenolide)
作者:Pedro de March、Marta Figueredo、Josep Font、Javier Raya
DOI:10.1021/ol991261k
日期:2000.1.1
[reaction: see text] A new, very efficient, enantioselective synthesis of the sexual attracting insect pheromone (+)-grandisol has been developed, in which the key step is the double [2 + 2] photocycloaddition of ethylene to a bis(alpha,beta-butenolide) readily available from D-mannitol. The C2 symmetry of the substrate and the appropriate protection of the central diol unit are the crucial features
<i>C</i><sub>2</sub>-Symmetric Enantiopure Ethanotethered Bis(α,β-butenolides) as Templates for Asymmetric Synthesis. Application to the Synthesis of (+)-Grandisol<sup>1</sup>
作者:Pedro de March、Marta Figueredo、Josep Font、Javier Raya、Angel Alvarez-Larena、Juan F. Piniella
DOI:10.1021/jo026705w
日期:2003.3.1
Starting from D-mannitol, we have prepared several C(2)-symmetric ethanotethered bis(alpha,beta-butenolides) 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