Diastereo- and Regioselective Addition of Thioamide Dianions to Imines and Aziridines: Synthesis of<i>N-</i>Thioacyl-1,2-diamines and<i>N-</i>Thioacyl-1,3-diamines
作者:Fumitoshi Shibahara、Shun-ichiro Kobayashi、Toshifumi Maruyama、Toshiaki Murai
DOI:10.1002/chem.201203470
日期:2013.1.2
Addition reactions of thioamide dianions that were derived from N‐arylmethyl thioamides to imines and aziridines were carried out. The reactions of imines gave the addition products of N‐thioacyl‐1,2‐diamines in a highly diastereoselective manner in good‐to‐excellent yields. The diastereomeric purity of these N‐thioacyl‐1,2‐diamines could be enriched by simple recrystallization. The reduction of N‐thioacyl‐1
进行了衍生自N-芳基甲基硫代酰胺的硫代酰胺双阴离子与亚胺和氮丙啶的加成反应。亚胺的反应以极高非对映选择性的方式产生了N-硫代酰基1,2-二胺加成产物,收率非常好。这些N-硫代酰基1,2-二胺的非对映异构体纯度可以通过简单的重结晶来富集。用LiAlH 4还原N-硫代酰基-1,2-二胺可以保持中等至良好的收率,并保留其立体化学,从而使其对应的1,2-二胺。N-硫代酰基1,2-二胺在CuCl 2 / O 2和I中的氧化脱硫/环化2 /吡啶体系以中等收率得到环化产物,并且反式异构体作为唯一产物获得。另一方面,用抗甲醛剂(NaClO水溶液)作氧化剂进行类似的环化反应,得到的顺式异构体为主要产物。N-甲苯磺酰基氮丙啶的反应产生了N-硫代酰基-1,3-二胺的加成产物,其非对映体选择性低,但区域选择性高,且收率良好。使用AlMe 3作为添加剂改善了反应的效率和区域选择性。所得产物的立体化学是通过X射线衍射测定的。