3-(6-benzyloxy-7-methoxy-1H-indol-3-ylmethyl)-8a-[4-(tert-butyl-dimethyl-silanyloxy)-3-methyl-but-2-enyl]-8-methyl-hexahydro-pyrrolo[1,2-a]pyrazine-1,4-dione 、 trimethoxonium tetrafluoroborate 在
caesium carbonate 作用下,
以
二氯甲烷 为溶剂,
反应 20.0h,
以71%的产率得到3S-(6-benzyloxy-7-methoxy-1H-indol-3-ylmethyl)-8aR-[4-(tert-butyl-dimethyl-silanyloxy)-3-methyl-but-2-enyl]-1-methoxy-8S-methyl-6,7,8,8a-tetrahydro-3H-pyrrolo[1,2-a]pyrazin-4-one