Chemodivergent Synthesis of Oxazoles and Oxime Ethers Initiated by Selective C–N/C–O Formation of Oximes and Diazo Esters
作者:Zhenjie Qi、Shaozhong Wang
DOI:10.1021/acs.orglett.1c03252
日期:2021.11.5
Chemodivergent reactions of oximes and diazo esters involving Rh-catalyzed [3+2] annulation and photodriven O–H insertion have been developed to generate oxazoles and oxime ethers. A range of aldehyde and ketone oximes reacted with α-diazocarbonyl compounds in a controllable manner in which functional groups, including ketone, ester, amide, ether, thiol ether, silane, alkene, allene, and alkyne groups
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。