(E)-3-{(4S,5R)-5-[(R)-2-(tert-Butyl-dimethyl-silanyloxy)-1-hydroxy-ethyl]-2,2-dimethyl-[1,3]dioxolan-4-yl}-2-((2S,5R)-5-isopropyl-3,6-dimethoxy-2,5-dihydro-pyrazin-2-ylmethyl)-acrylic acid ethyl ester 在
1,8-二氮杂双环[5.4.0]十一碳-7-烯 作用下,
以
乙腈 为溶剂,
反应 20.0h,
生成 2-[(3aS,4S,6R,6aR)-6-(tert-Butyl-dimethyl-silanyloxymethyl)-2,2-dimethyl-tetrahydro-furo[3,4-d][1,3]dioxol-4-yl]-3-((2S,5R)-5-isopropyl-3,6-dimethoxy-2,5-dihydro-pyrazin-2-yl)-propionic acid ethyl ester