二叔丁基硅基双(三氟甲烷磺酸) 、
(-)-(1S,2R,3R,4R,5R,6R)-6-endo-chloro-3-exo-{(S)-hydroxy[(3aS,4aS,7aS,7bR)-3a,4a,7a,7b-tetrahydro-6,6-dimethyl[1,3]dioxolo[4,5]furo[2,3-d]isoxazol-3-yl]methyl}-5-exo-(phenylseleno)-7-oxabicyclo[2.2.1]heptan-2-endo-ol 在
2,6-二甲基吡啶 作用下,
以
二氯甲烷 为溶剂,
反应 6.0h,
以45%的产率得到(-)-(4S,4aR,5R,6R,7R,8S,8aR)-2,2-di(tert-butyl)-7-chloro-4-[(3aS,4aS,7aS,7bR)-3a,4a,7a,7b-tetrahydro-6,6-dimethyl[1,3]dioxolo[4,5]furo[2,3-d]isoxazol-3-yl]-4a,5,6,7,8,8a-hexahydro-6-(phenylseleno)-5,8-epoxy-4H-1,3,2-benzodioxasiline