Exclusive 6-endo radical cyclizations of α-silyl radicals derived from carbohydrate allylic silylethers
摘要:
The cyclization of 2-sila-3-oxa-5-hexen-1-yl radicals in conformationaly biased sugar ring systems depends on the stereochemistry of the starting allylic alcohol and proceeds exclusively via the 6-endo mode with a preference for the formation of cis fused-rings.