methyl (3a'R,5'R,6'S,6a'R)-2-methoxycarbonyl-3-(3-indolyl)-3-(6'-hydroxy-2',2'-dimethyl-tetrahydrofuro[2,3-d][1,3]dioxol-5'-yl)propanoate 在
potassium tert-butylate 作用下,
以
四氢呋喃 为溶剂,
以69%的产率得到(3aR,3bS,6S,7S,7aR,8aR)-7-(3-indolyl)-2,2-dimethyl-5-oxo-hexahydro-1,3-dioxolo[4,5]furo[3,2-b]pyran-6-carboxylic acid methyl ester