丙二酸环(亚)异丙酯 、
苄叉丙酮 、
(2S,5R,6R)-5,6-dimethoxy-5,6-dimethyl-[1,4]dioxane-2-carbaldehyde 在
L-脯氨酸 作用下,
以
乙腈 为溶剂,
反应 48.0h,
生成
(2'R,3'R,6'R,7S,11S)-7-(2,3-dimethoxy-2,3-dimethyl-[1,4]dioxan-6-yl)-3,3-dimethyl-11-phenyl-2,4-dioxaspiro[5.5]undecane-1,5,9-trione 、 (2'R,3'R,6'R,7R,11R)-7-(2,3-dimethoxy-2,3-dimethyl-[1,4]dioxan-6-yl)-3,3-dimethyl-11-phenyl-2,4-dioxaspiro[5.5]undecane-1,5,9-trione