作者:Pradeep K. Sharma、Min He、Jurjus Jurayj、Da-Ming Gou、Richard Lombardy、Leo J. Romanczy、Hagen Schroeter
DOI:10.3390/molecules15085595
日期:——
The first enantioselective syntheses of sulfur flavan-3-ol analogues 1–8 have been accomplished, whereby the oxygen atom of the pyran ring has been replaced by a sulfur atom. The key steps were: (a) Pd(0) catalyzed introduction of –S t-butyl group, (b) Sharpless enantioselective dihydroxylation of the alkene, (c) acid catalyzed ring closure to produce the thiopyran ring, and (d) removal of benzyl groups using N,N-dimethylaniline and AlCl3. The compounds were isolated in high chemical and optical purity.
首次完成了硫代黄烷-3-醇类似物1-8的手性选择性合成,其中吡喃环上的氧原子被硫原子取代。关键步骤包括:(a) 通过Pd(0)催化引入-S t-丁基,(b) 使用Sharpless方法对烯烃进行手性选择性二羟基化,(c) 酸性催化闭环生成噻吡喃环,以及(d) 利用N,N-二甲基苯胺和AlCl3去除苄基。合成的化合物具有高化学纯度和光学纯度。