The [2 + 2] photocycloaddition of acetylene to chiral 2(5H)-furanones was investigated. The influence on the chemical yield and facial diastereoselectivity of the substituent at the stereogenic center and also the effect of a 4-methyl group were evaluated. A mechanistic proposal based on a simple theoretical conformational analysis is presented. Using a C2-symmetric bis(lactone) as the substrate, a diastereomeric excess higher than 98% was found.
|Journal||Journal of Organic Chemistry|
|Publication status||Published - 21 Feb 2003|