作者:Darne, Chetan Padmakar、Li, Ning、Smith, Daniel、Zhang, Shasha、Neithnadka, Premsai Rai、Silamkoti, Arundutt、Arumugam, Arunachalam、Gupta, Anuradha、Hong, Zhenqiu、Krishnananthan, Subramaniam、Wang, Bei、Zhao, Rulin、Yip, Shiuhang、Wu, Dauh-Rurng、Kempson, James、Mortensen, Deborah S.、Mathur, Arvind、Li, Jianqing
DOI:10.1021/acs.oprd.4c00289
日期:——
(S)- and (R)-N-Boc-3-(trifluoromethyl)piperazines are attractive building blocks for the rational design of drugs. Until now, their chiral syntheses were unknown. Exploration of three synthetic approaches via chiral 3,3,3-trifluoropropane-1,2-diamines yielded a scalable route that has been used for multigram synthesis. Two routes were not amendable for scale-up due to low yielding, tedious purification
( S )-和( R ) -N -Boc-3-(三氟甲基)哌嗪是药物合理设计的有吸引力的构建模块。到目前为止,他们的手性合成尚不清楚。通过手性 3,3,3-三氟丙烷-1,2-二胺探索三种合成方法,产生了一条可扩展的路线,已用于多克合成。由于产量低、纯化繁琐、试剂可用性有限以及安全问题,两条路线无法修改以扩大规模。该成功且实用的路线依赖于改进的工艺来减轻合成( E )-3,3,3-三氟-1-硝基丙-1-烯的安全问题,该路线被用作高度非对映选择性的储备溶液光学纯4-苯基-2-恶唑烷酮的氮杂-迈克尔加成。氨基的 Boc 保护允许随后在温和条件下转化为手性N -Boc 保护的 3,3,3-三氟丙烷-1,2-二胺,无需手性色谱。手性N -Boc-保护的3,3,3-三氟丙烷-1,2-二胺与2-氯乙酰氯酰胺化,然后进行分子内环化和随后的还原,得到对映体纯的N -Boc-3-(三氟甲基)哌嗪。