Stereoselective Capture of <i>N</i>-Acyliminium Ions Generated from α-Hydroxy-<i>N</i>-acylcarbamides: Direct Synthesis of Uracils from Barbituric Acids Enabled by SmI<sub>2</sub> Reduction
作者:Michal Szostak、Brice Sautier、David J. Procter
DOI:10.1021/ol403340j
日期:2014.1.17
Lewis acid promoted cleavage of α-amino alcohols derived from barbituric acids via chemoselective Sm(II)-mediated electron transfer affords a wide range of C6-substituted 5,6-dihydrouracils. The reaction involves the first generation of N-acyliminium ions directly from the versatile barbituric acids and proceeds with excellent stereoselectivity. The products are shown to be active in generic transition
路易斯酸通过化学选择性Sm(II)介导的电子转移促进了从巴比妥酸衍生的α-氨基醇的裂解,从而提供了广泛的C6取代的5,6-二氢尿嘧啶。该反应涉及直接从通用巴比妥酸产生的第一代N-酰基亚胺离子,并以优异的立体选择性进行。该产物在一般的过渡金属催化的反应中具有活性,从而为生物学上重要的尿嘧啶衍生物提供了模块化且高度实用的序列。