Catalytic asymmetric Diels–Alder reactions of α-thioacrylates for the preparation of norbornenone
作者:Varinder K. Aggarwal、Emma S. Anderson、D. Elfyn Jones、Kerstin B. Obierey、Robert Giles
DOI:10.1039/a805366i
日期:——
CuIIâbisoxazoline complexes catalyse the asymmetric DielsâAlder cycloaddition of α-thioacrylates with cyclopentadiene to give the cycloadducts in up to 92% yield, 88% de and >95% ee for the endo product; deprotection gives good yields of (1S,4S)-norbornenone with high enantioselectivity.