Comprehensive and Facile Entry into Substituted Amidines via the Condensation of N-Pmc-Substituted Thioamides with Amines Using Mukaiyama Reagent as a Thiophile
作者:José Madalengoitia、Stevenson Flemer
DOI:10.1055/s-0030-1260011
日期:2011.5
revealing interesting synthetic challenges and constraints. Many of these limitations were overcome through the application of alternative reaction pathways in the construction of troublesome products. Treatment of the resultant Pmc-amidines with trifluoroacetic acid and trimethylsilyl trifluoromethanesulfonate cleanly afforded the deprotected substituted amidines. amidine - thioamide - Mukaiyama reagent
提出了一种通过N-Pmc-取代的硫代酰胺与胺的融合来制备取代的idine的简便方法,该方法由多种亲硫试剂促进。评估了各种亲硫试剂在两个伙伴之间作为缩合试剂的有效性,其中,Mukaiyama试剂已成为该方法的最佳候选。探索了这种方法的范围和局限性,揭示了有趣的综合挑战和制约因素。通过在不良产品的构建中使用替代反应途径,克服了许多这些局限性。用三氟乙酸和三甲基甲硅烷基三氟甲磺酸酯处理所得的Pmc- clean,干净地得到脱保护的取代的am。 idine-硫代酰胺-Mukaiyama试剂-噻吩-N-磺酰基