methyl (2R,3S,4S,6R,7R,8E,10S)-5,11-bisoxo-2,7-bis[(tert-butyldimethylsilyl)oxy]-3-methoxy-4,6,8,10-tetramethyldodec-8-enoate 、 Acetic acid (2S,3S,4S)-2-((S)-(tert-butyl-dimethyl-silanyloxy)-{(2S,3R)-3-[(S)-2-(4-methoxy-benzyloxy)-1-methyl-ethyl]-2-methyl-oxiranyl}-methyl)-4-methyl-5-oxo-3-triethylsilanyloxy-pentyl ester 在
4 A molecular sieve 、
lithium hexamethyldisilazane 作用下,
以
四氢呋喃 为溶剂,
以42%的产率得到methyl (2R,3S,4S,6R,7R,8E,10S,13S,14R,15R,16S,17S,18S,19R,20S)-5,11-bisoxo-16-(acetyloxymethyl)-18,19-epoxy-21-(4-methoxybenzyloxy)-3-methoxy-4,6,8,10,14,18,20-heptamethyl-13-hydroxy-15-(OSiEt3)-2,7,17-tris(t-butyldimethylsilyloxy)henicos-8-enoate