(5S)-(D-menthyloxy)-2(5H)-furanone 、
(2E,4E)-5-(tert-butoxycarbonylamino)penta-2,4-dienoic acid methyl ester 在
lithium hydroxide 作用下,
以
甲苯 为溶剂,
反应 120.0h,
以72%的产率得到(3S,3aR,7R,7aS)-methyl 7-((tert-butoxycarbonyl)amino)-3-(((1S,2R,5S)-5-methyl-2-(1-methylethyl)cyclohexyl)oxy)-1-oxo-1,3,3a,6,7,7a-hexahydroisobenzofuran-4-carboxylate