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.
CuII 双
噁唑啉配合物能催化δ-
硫代
丙烯酸酯与
环戊二烯的不对称 DielsâAlder 环加成反应,生成的环加成物产率高达 92%,de 为 88%,内生产物的ee >95%;
脱保护剂能以较高的对映选择性获得产率良好的 (1S,4S)-
降冰片烯酮。