CHIRALITY PRESERVATION OF A CATION-RADICAL INTERMEDIATE - TANDEM OXIDATIVE RING EXPANSION-CYCLIZATION REACTION OF OPTICALLY-ACTIVE BICYCLO[4.1.0]HEPTYL SULFIDES
Y. Takemoto et al., CHIRALITY PRESERVATION OF A CATION-RADICAL INTERMEDIATE - TANDEM OXIDATIVE RING EXPANSION-CYCLIZATION REACTION OF OPTICALLY-ACTIVE BICYCLO[4.1.0]HEPTYL SULFIDES, Journal of organic chemistry, 59(17), 1994, pp. 4727-4729
Asymmetric synthesis of 1-oxaspiro[4.6]undecan-7-one and spiro[4.6]und
ecanes has been achieved by a regio- and stereoselective tandem oxidat
ive ring expansion-cyclization reaction of chiral bicyclo[4.1.0]heptyl
sulfides bearing an alcohol or electron-rich olefin in the C-6 side c
hain via a cation radical intermediate.