2,2-二甲氧基丙烷 、
(1S,2R,3S,4R,5R,6R)-6-endo-chloro-3-endo-{(S)-hydroxy[(3aR,4aR,7aR,7bS)-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
对甲苯磺酸 作用下,
以
丙酮 为溶剂,
反应 5.0h,
以89%的产率得到(-)-(4S,4aS,5R,6R,7R,8S,8aR)-7-chloro-2,2-dimethyl-6-(phenylseleno)-4-[(3aR,4aR,7aR,7bS)-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-5,8-epoxy-4H-1,3-benzodioxine