马来酸酐 、
6-Ethyl-2-methyl-9-vinyl-6,7-dihydro-5-thia-6-aza-benzocycloheptene 5,5-dioxide 以
甲苯 为溶剂,
反应 2.0h,
以61%的产率得到(3aS,3bR,12aR)-5-Ethyl-9-methyl-6,6-dioxo-3b,4,5,6,12,12a-hexahydro-3aH-2-oxa-6λ
6-thia-5-aza-benzo[3,4]cyclohepta[1,2-e]indene-1,3-dione