Highly Enantioselective Reaction of α-Selenoorganolithium Compounds with Chiral Bis (oxazoline) s and Preparation of Enantioenriched Benzylidencyclohexanes
The enantioselective reaction of α-seleno carbanions derived from bis (phenylseleno) acetal and bis (2-pyridylseleno) acetal in the presence of bis (oxazoline) s with various electrophiles gave products with high enantioselectivity. The enantioselective reaction of α- lithio benzyl 2-pyridyl selenide gave the products with stereochemistry reverse to that obtained in the reaction of α-lithio benzyl phenyl selenide. Mechanistic investigation ...