2,2-二甲氧基丙烷 、
(+)-(1R,2R,3S,4R)-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-phenylseleno-7-oxabicyclo[2.2.1]hept-5-en-2-one 在
对甲苯磺酸 作用下,
以
丙酮 为溶剂,
反应 5.0h,
以88%的产率得到(+)-(4S,4aS,5R,8R,8aR)-4a,5,8,8a-tetrahyydro-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]-5,8-epoxy-4H-1,3-benzodioxine