作者:Xiao-Jun Wang、Rogelio P. Frutos、Li Zhang、Xiufeng Sun、Yibo Xu、Thomas Wirth、Thomas Nicola、Lawrence J. Nummy、Dhileep Krishnamurthy、Carl A. Busacca、Nathan Yee、Chris H. Senanayake
DOI:10.1021/op200175t
日期:2011.9.16
The synthesis of LFA-1 inhibitor BIRT2584 on metric-ton scale was accomplished by means of a safe and robust process. Highlights of the process include the asymmetric synthesis of the key advanced intermediate by implementation of Seebach’s self-regeneration of stereocenters principle, and a Ph3PCl2-induced dehydration of a critical urea followed by a regioselective bromination to give the elaborated
LFA-1抑制剂BIRT2584的合成以公吨为单位,是通过安全,可靠的方法完成的。该方法的亮点包括通过实施Seebach立体中心原理的自我再生来不对称合成关键高级中间体,以及Ph 3 PCl 2诱导的关键尿素脱水,然后进行区域选择性溴化,得到了精细的1 H-咪唑[1,2 - a ]咪唑-2-one。通过碘代咪唑的Br / Mg交换,然后在THF中添加至SO 2并随后进行氧化,可制得磺酰氯中间体。在一个单釜操作中,磺酰氯直接反应用升-在DMF / THF水溶液中使用NaOH作为碱的α-丙氨酰胺,得到BIRT2584。