Copper-Catalyzed β-Lactam Formation Initiated by 1,3-Azaprotio Transfer of Oximes and Methyl Propiolate
作者:Zhenjie Qi、Shaozhong Wang
DOI:10.1021/acs.orglett.1c01937
日期:2021.8.6
A copper(II)-catalyzed protocol to construct trans-configured β-lactams and spirocyclic β-lactams from oximes and methylpropiolate has been developed, which features excellent substrate flexibility and diastereoselectivity (up to >99:1 dr). In situ FT-IR mechanistic experiments support that ketene species might be involved in the formation of β-lactams.
已经开发了一种铜 (II) 催化的协议,用于从肟和丙炔酸甲酯构建反式配置的β-内酰胺和螺环 β-内酰胺,其具有出色的底物灵活性和非对映选择性(高达 >99:1 dr)。原位 FT-IR 机械实验支持乙烯酮物质可能参与 β-内酰胺的形成。
Synthesis and Thermal Stability of O-Vinylketoximes
作者:Boris A. Trofimov、Al'bina I. Mikhaleva、Alexander M. Vasil'tsov、Elena Yu. Schmidt、Ol'ga A. Tarasova、Ludmila V. Morozova、Lubov' N. Sobenina、Thomas Preiss、Jochem Henkelmann
DOI:10.1055/s-2000-6330
日期:——
The O-vinylketoximes 2 were synthesized from ketoximes 1 and acetylene in superbase systems in good to excellent yields. Their thermal stability was investigated.
O-乙烯基酮肟2是通过酮肟1与乙炔在超强碱体系中合成的,产率良好至优异。它们的热稳定性得到了研究。
Microwave-assisted efficient one-step synthesis of amides from ketones and benzoxazoles from (2-hydroxyaryl) ketones with acetohydroxamic acid using sulfuric acid as the catalyst
Efficient one-step method for the synthesis of amides directly from ketones and benzoxazoles from (2-hydroxyaryl) ketones by the reaction of acetohydroxamic acidusing sulfuric acid as catalyst was described.