Birch Reduction of (−)-Ephedrine. Formation of a New, Versatile Intermediate for Organic Synthesis
作者:Gury Zvilichovsky、Isra Gbara-Haj-Yahia
DOI:10.1021/jo049726u
日期:2004.8.1
The reduction of (−)-ephedrine by lithium in liquid ammonia resulted in the formation of S-1-(1,4-cyclohexadien-1-yl)-N-methyl-2-propanamine. In addition to the reduction of the aromatic ring, the hydroxy group was reduced as well. The resulting 1,4-cyclohexadienyl group is a potentially versatile intermediate for further synthetic transformations. The ozonolysis of this group was investigated, producing
锂在液态氨中还原(-)-麻黄碱导致形成S -1-(1,4-环己二-1-基)-N-甲基-2-丙胺。除了芳环的还原之外,羟基也被还原。所得的1,4-环己二烯基是用于进一步合成转化的潜在通用中间体。对这组的臭氧分解进行了研究,产生了β-酮-δ-甲基氨基酯和β-酮醛的衍生物,这些衍生物随后可以转化为杂环。描述了对N-苯甲酰基-1-(1,4-环己二-1-基)-N-甲基-2-丙胺中CN键旋转的限制。