1,3,2-Thiazaphospholidin-2-ones derived from ephedrine. Preparation and stereochemistry of ring-opening reactions
作者:C. Richard Hall、Nancy E. Williams
DOI:10.1039/p19810002746
日期:——
1,3,2-Thiazaphospholidin-2-ones are prepared by rearrangement of the corresponding 1,3,2-oxazaphospholidine-2-thiones. In both the phosphono- and phosphoro-series treatment with alkoxide results in P–N bond cleavage with inversion of configuration, while treatment with Grignard reagents results in P–S bond cleavage with retention of configuration. The products are consistent with a mechanism which
通过重排相应的1,3,2-氧杂氮磷吡啶-2-硫酮来制备1,3,2-噻氮磷腈-2-酮。在膦酸酯系列和磷酸酯系列中,用醇盐处理均会导致P–N键断裂,且构型反转,而使用格氏试剂处理会导致P–S键断裂,且构型得以保留。该产物与涉及与环内氮相反的初始亲核攻击的机理是一致的。