、
(2S,3S,5R,6R)-5-ethenyl-2,3-dimethoxy-2,3,6-trimethyl-1,4-dioxane 在
caesium carbonate 作用下,
以
乙二醇二甲醚 为溶剂,
生成 3-{2-[(
tert-butyl-diphenyl-silanyloxy)-oxazol-5-yl-methyl]-oxazol-4-yl}-5-(5,6-dimethoxy-3,5,6-trimethyl-[1,4]dioxan-2-yl)-4,5-dihydro-isoxazole 、 (R)-1-{2-[(S)-(tert-butyldiphenylsilyloxy)oxazol-5-ylmethyl]oxazol-4-yl}-3-[(2R,3R,5S,6S)-5,6-dimethoxy-3,5,6-trimethyl-[1,4]dioxan-2-yl]-3-hydroxypropan-1-one