Synthesis of N-Sulfonyl Amidines and Acyl Sulfonyl Ureas from Sulfonyl Azides, Carbon Monoxide, and Amides
作者:Shiao Y. Chow、Luke R. Odell
DOI:10.1021/acs.joc.6b02894
日期:2017.3.3
A Pd-catalyzed and ligand-free carbonylation/cycloaddition/decarboxylation cascade synthesis of sulfonyl amidines from sulfonyl azides and substituted amides at low CO pressure is reported. The reaction proceeds via an initial Pd-catalyzed carbonylative generation of sulfonyl isocyanates from sulfonyl azides, followed by a [2 + 2] cycloaddition with amides and subsequent decarboxylation, which liberates
据报道,在低CO压力下,由磺酰叠氮化物和取代的酰胺进行Pd催化的无配体羰基化/环加成/脱羧级联反应合成了磺酰am。反应是通过首先由Pd催化从磺酰叠氮化物的羰基化羰基生成磺酰异氰酸酯,然后与酰胺进行[2 + 2]环加成,然后脱羧,从而释放出所需的磺酰am,生成N 2和CO 2。作为唯一的反应副产物。使用此简单方案,可以以中等到极好的收率获得各种磺酰基am。另外,该反应还可以通过使用N-单取代的酰胺亲核试剂通过更常规的酰胺羰基化途径来进行,以良好的产率提供酰基磺酰基脲。