5,5-二取代乙内酰脲,形式上是季氨基酸的环化产物,是通过一锅串联法由简单的酯衍生原料连接形成的。甲基酯的甲硅烷基乙烯酮缩醛衍生物的胺化通过银催化加成到偶氮甲酰胺的 N N 键,产生N-氨基-N取代氨基酯的'-芳基脲衍生物。用碱处理形成酯烯醇化物,其通过芳基环的分子内迁移到酯的α-位而发生芳基化。产品经过环闭合形成乙内酰脲,其本身可能被去保护和功能化。芳基迁移对于具有各种电子特性的环以及带有官能化和非官能化链的酯是成功的,并且产品具有与几种生物活性化合物的共同特征。
5,5-二取代乙内酰脲,形式上是季氨基酸的环化产物,是通过一锅串联法由简单的酯衍生原料连接形成的。甲基酯的甲硅烷基乙烯酮缩醛衍生物的胺化通过银催化加成到偶氮甲酰胺的 N N 键,产生N-氨基-N取代氨基酯的'-芳基脲衍生物。用碱处理形成酯烯醇化物,其通过芳基环的分子内迁移到酯的α-位而发生芳基化。产品经过环闭合形成乙内酰脲,其本身可能被去保护和功能化。芳基迁移对于具有各种电子特性的环以及带有官能化和非官能化链的酯是成功的,并且产品具有与几种生物活性化合物的共同特征。
Asymmetric Hetero-Diels–Alder Reaction of Diazenes Catalyzed by Chiral Silver Phosphate: Water Participates in the Catalysis and Stereocontrol
作者:Bin Liu、Tong-Yu Liu、Shi-Wei Luo、Liu-Zhu Gong
DOI:10.1021/ol503047s
日期:2014.12.5
The chiral silver phosphate was confirmed to efficiently catalyze a highly regio- and enantioselective hetero-Diels–Alder reaction of diazenes to furnish piperazine derivatives in high yields and excellent ee values. DFT calculations revealed that the water molecule participates in the catalysis by coordination to silver phosphate and also found that the hydroxy group of 1-hydroxy-2,3-hexadiene not
Chiral Gold Complex-Catalyzed Hetero-Diels–Alder Reaction of Diazenes: Highly Enantioselective and General for Dienes
作者:Bin Liu、Kang-Nan Li、Shi-Wei Luo、Jian-Zhou Huang、Huan Pang、Liu-Zhu Gong
DOI:10.1021/ja3110472
日期:2013.3.6
A chiral gold(I) complex-catalyzed highly regio- and enantioselective azo hetero-Diels-Alder reaction has been developed. The chiral gold(I) complex acting as a Lewis acid exhibits high efficiency in the activation of urea-based diazene dienophiles. Moreover, this chiral goldcatalyst also rendered a cascade intramolecular enyne cycloisomerization/asymmetric azo-HDA reaction.