(2R,3a'S,4R,5R,6'R,7'R,7a'R)-7'-(benzyloxy)-6'-methoxy-5-((4-methoxybenzyl)oxy)octahydro-4'H-spiro[pyran-2,2'-[1,3]dioxolo[4,5-c]pyran]-4-yl methanesulfonate 在
1,8-二氮杂双环[5.4.0]十一碳-7-烯 作用下,
以
甲苯 为溶剂,
反应 24.0h,
以87%的产率得到(2R,3a'S,5S,6'R,7'R,7a'R)-7'-(benzyloxy)-6'-methoxy-5-((4-methoxybenzyl)oxy)-3a',5,6,6',7',7a'-hexahydro-4'H-spiro[pyran-2,2'-[1,3]dioxolo[4,5-c]pyran]