Efficient Synthesis of a Key Intermediate for Moxifloxacin Via Intramolecular Double Stereodifferentiation
作者:Shouzhu Liao、Guodong Sun、Shuming Wu、Zaiyou Yang、Benquan Hu、Zhuangfeng Liu、Junhai Qin、Hailong Wang、Zhongqing Wang
DOI:10.1021/acs.oprd.2c00183
日期:2022.8.19
An intramolecular double stereodifferentiation methodology was developed during the synthetic process development of (S,S)-2,8-diazobicylo[4.3.0] nonane (1), the key intermediate of the fourth-generation fluoroquinolone Moxifloxacin. The dual chiral-auxiliary strategy employed in this process guaranteed high stereoselectivity of the hydrogenation reaction to build the cis-[5,6] bicyclic system with
在第四代氟喹诺酮莫西沙星的关键中间体( S , S )-2,8-二唑二环[4.3.0]壬烷( 1 )的合成工艺开发过程中,建立了分子内双立体分化方法。该过程中采用的双手性-辅助策略保证了氢化反应的高立体选择性,以构建具有所需立体化学的顺式-[5,6]双环体系。1,6-Bis(( R )-1-苯乙基)-3,4,6,7-四氢-1H-吡咯并[3,4- b ]吡啶-2,5-二酮( 11f ),前体氢化反应,由市售且负担得起的化学品乙酰乙酸乙酯制备,(R)-(+)-1-甲基苄胺和丙烯酰氯,并且通过将前三个步骤伸缩到一个锅中进一步促进了该过程。此外,该工艺已被证明在百克规模上是稳健的,提供 450 g 中间体1,7个步骤的总产率为 56.2%,对映体过量超过 99%,证明了商业规模应用的潜力。