Practical Synthesis of PGI<sub>2</sub> Agonist: Resolution–Inversion–Recycle Approach of Its Chiral Intermediate
作者:Atsushi Ohigashi、Atsushi Kanda、Shigeru Moriki、Yukihisa Baba、Norio Hashimoto、Minoru Okada
DOI:10.1021/op3003085
日期:2013.4.19
Practical synthesis of ((2R)-5-benzyloxy-2-hydroxy-1,2,3,4-tetrahydronaphth-2-yl)methanol ((R)-7b), a key chiral intermediate for the synthesis of the novel PGI2 agonist, (R)-[6-[(diphenylcarbamoyloxy)methyl]-6-hydroxy-5,6,7,8-tetrahydronaphthalen-1-yloxy]acetic acid (1), was achieved via optical resolution by diastereoselective crystallization of ester derivative 18 of racemic (5-benzyloxy-2-hydroxy-1
实用合成((2 R)-5-苄氧基-2-羟基-1,2,3,4-四氢萘-2-基)甲醇((R)-7b),这是合成该新型手性化合物的关键手性中间体通过非对映选择性结晶的光学拆分获得PGI 2激动剂(R)-[6-[(二苯基氨基甲酰氧基)甲基] -6-羟基-5,6,7,8-四氢萘-1-基氧基]乙酸(1)。的酯衍生物18外消旋的(5-苄氧基-2-羟基-1,2,3,4-四氢萘-2-基)甲醇(的图7b)与(1小号,4 - [R )- ( - ) -莰烷酸(( −)-CpOH),然后进行皂化。从可商购获得的5-羟基-1-四氢萘酮(2)开始,此过程的特点是通过酸催化环氧化物衍生物(S)-11水解C2羟基而使不需要的对映异构体(S)-7b再循环。进行这种拆分-反转-再循环方法,得到了外消旋7b的(R)-7b(> 99%ee)的总产率为44%。然后将通过这种方法合成的对映纯(R)-7b用于制备1。这种强大,可重现和可扩展的1合成