Efficient Synthesis and Practical Resolution of 1-(Naphthalen-1-yl)ethanamine, a Key Intermediate for Cinacalcet
作者:Vijayavitthal T. Mathad、Gorakshanath B. Shinde、Sharad S. Ippar、Navnath C. Niphade、Raghavendra K. Panchangam、Pravinchandra J. Vankawala
DOI:10.1080/00397910903538651
日期:2011.1.25
and its practical resolution to optically pure (1R)-(naphthalen-1-yl)ethanamine ( R -(+)-2), a key intermediate in the synthesis of cinacalcet hydrochloride (1), is described. The resolution of RS -2 using R-(−)-mandelic acid as a resolving agent in ethanol was established on an industrial scale to give pure R -(+)-2 with >99.8% ee after liberation of the amine from its mandelate salt. An efficient
1-(萘-1-基)乙胺 (RS -2) 的有效合成及其对光学纯 (1R)-(萘-1-基) 乙胺 (R -(+)-2) 的实用拆分,这是一个关键描述了西那卡塞盐酸盐 (1) 的合成中间体。在工业规模上建立了使用 R-(-)-扁桃酸作为乙醇中的拆分剂拆分 RS -2,在胺从扁桃酸中释放出来后得到纯度 >99.8% ee 的 R-(+)-2盐。还提供了用于不需要的异构体 S -(-)-2 的外消旋化的有效方法以最大化所需对映体的产率。