(E)-3-[(2R,4aR,6S,7R,8aS)-6-{3-[(2R,3S,5R,6S)-5-Benzyloxy-6-benzyloxymethyl-2-(1-ethoxy-ethoxymethyl)-tetrahydro-pyran-3-yloxy]-3-phenylsulfanyl-propyl}-2-(4-methoxy-phenyl)-hexahydro-pyrano[3,2-d][1,3]dioxin-7-yloxy]-acrylic acid methyl ester 在
偶氮二异丁腈 、
三正丁基氢锡 作用下,
以
甲苯 为溶剂,
以92%的产率得到[(2R,4aR,5aS,8R,9S,10aR,11aS)-8-[(2R,3S,5R,6S)-5-Benzyloxy-6-benzyloxymethyl-2-(1-ethoxy-ethoxymethyl)-tetrahydro-pyran-3-yloxy]-2-(4-methoxy-phenyl)-decahydro-1,3,5,10-tetraoxa-cyclohepta[b]naphthalen-9-yl]-acetic acid methyl ester