作者:Huang Dai-Fei、Huang Liang
DOI:10.1016/s0040-4020(01)85453-3
日期:1990.1
Asymmetric synthesis of (-)-dehydroclausenamide 1 by scheme 2 was reported. Sharpless epoxidation was applied to cinnamyl alcohol for introduction of two desired chiral centers and the potential hydroxyl group. The key intermediate, γ-lactam (-)-5, was obtained by regio-selective intramolecular cyclization of (-)-6. Subsequent stereo-selective reduction was achieved by reducing C3-tetrahydropyranyl
据报道,通过方案2不对称合成(-)-脱氢clausenamide 1。对肉桂醇进行无尖锐的环氧化,以引入两个所需的手性中心和潜在的羟基。关键中间体,γ内酰胺( - ) - 5( - ) - ,被的区域选择性分子内环化得到6。随后的立体选择性还原是通过还原(-)- 5的C 3-四氢吡喃基醚实现的。然后通过连续的甲苯磺酸化,水解和环化获得标题天然产物。