tert-butyl (2Z)-3-[(4S)-2,2-dimethyl-1,3-dioxolan-4-yl]prop-2-enyl (prop-2-ynyloxy)carbamate 、 alkaline earth salt of/the/ methylsulfuric acid 在
氮 、
十二/十四烷基二甲基氧化胺 作用下,
以
二氯甲烷 为溶剂,
反应 1.0h,
生成 tert-butyl (4aS,5S)-5-[(4S)-2,2-dimethyl-1,3-dioxolan-4-yl]-6-oxo-4,4a,5,6-tetrahydrocyclopenta[d][1,2]oxazine-3(1H)-carboxylate 、 tert-butyl (4aR,5R)-5-[(4S)-2,2-dimethyl-1,3-dioxolan-4-yl]-6-oxo-4,4a,5,6-tetrahydrocyclopenta[d][1,2]oxazine-3(1H)-carboxylate