Radical–Radical Cyclization Cascades of Barbiturates Triggered by Electron-Transfer Reduction of Amide-Type Carbonyls
作者:Huan-Ming Huang、David J. Procter
DOI:10.1021/jacs.6b04086
日期:2016.6.22
radical-radical cyclizationcascades. An alternative fragmentation-radical cyclization sequence of related substrates allows access to bicyclic uracil derivatives. The radical-radical cyclizationprocess constitutes the first example of a radical cascade involving ET reduction of the amide carbonyl. Products of the cascade can be readily manipulated to give highly unusual and medicinally relevant bi-
自由基-自由基环化级联由 SmI2-H2O 向酰胺型羰基的单电子转移触发,一步将简单的非手性巴比妥酸盐转化为含半胺或烯胺的三环支架,其中含有多达五个连续的立体中心(包括四元立体中心)。此外,我们描述了 LiBr 对最具挑战性的自由基 - 自由基环化级联的惊人有益影响。相关底物的另一种断裂-自由基环化序列允许获得双环尿嘧啶衍生物。自由基-自由基环化过程构成了涉及酰胺羰基 ET 还原的自由基级联的第一个例子。级联产物可以很容易地得到非常不寻常和医学上相关的双环和三环巴比妥酸盐。
DE526854
申请人:——
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