Intermolecular Ene Reactions Utilizing Oxazolones and Enol Ethers
摘要:
We report herein an intermolecular ene reaction using oxazolones with enol ethers which results in the formation of novel quaternary amino esters in near quantitative yields. The overall reaction transformation closely resembles an intermolecular version of the Conia-ene reaction. The reactions are uncatalyzed and occur under very mild conditions.
Catalyst-free racemic and H<sub>2</sub>O/CPA-catalyzed asymmetric regio-reversed domino processes of triketone enones with azlactones
作者:Yun-Dong Fu、Xiang Gao、Shi-Kun Jia、Xiao Xiao、Min-Can Wang、Lihua Huang、Guang-Jian Mei
DOI:10.1039/d3gc01445b
日期:——
Regio-reversed domino processes of triketone enones with azlactones have been established. Opposite to the previous β-addition-triggered domino processes, this protocol is initiated by a regio-reversed α-addition. Under catalyst-free conditions, the dominoreaction readily occurred, leading to the formation of a variety of bicyclic furofurans bearing vicinal quaternary carbons in good to excellent
Catalytic asymmetric <i>de novo</i> construction of 4-pyrrolin-2-ones <i>via</i> intermolecular formal [3+2] cycloaddition of azoalkenes with azlactones
作者:Nan-Nan Mo、Yu-Hang Miao、Xiao Xiao、Yuan-Zhao Hua、Min-Can Wang、Lihua Huang、Guang-Jian Mei
DOI:10.1039/d3cc01194a
日期:——
The chiral phosphoric acid-catalyzed asymmetric intermolecular formal [3+2] cycloaddition of azoalkenes with azlactones has been established. This convergent protocol leads to a facile and enantioselective de novo construction of a wide range of fully substituted 4-pyrrolin-2-ones bearing a fully substituted carbon atom in good yields and with excellent enantioselectivities (26 examples, 72–95% yields
Intermolecular Ene Reactions Utilizing Oxazolones and Enol Ethers
作者:Jason S. Fisk、Jetze J. Tepe
DOI:10.1021/ja0627904
日期:2007.3.1
We report herein an intermolecular ene reaction using oxazolones with enol ethers which results in the formation of novel quaternary amino esters in near quantitative yields. The overall reaction transformation closely resembles an intermolecular version of the Conia-ene reaction. The reactions are uncatalyzed and occur under very mild conditions.
Synthesis of <i>tert</i>-Alkyl Amino Hydroxy Carboxylic Esters via an Intermolecular Ene-Type Reaction of Oxazolones and Enol Ethers
作者:Robert A. Mosey、Jason S. Fisk、Timothy L. Friebe、Jetze J. Tepe
DOI:10.1021/ol702941f
日期:2008.3.1
tert-Alkyl amino hydroxy carboxylic acids are abundantly present within the structure of many biologically active natural products. We describe herein the synthesis of these substrates using an oxazolone-mediated ene-type reaction with enolethers followed by NaBH4 reduction of the intermediate oxazolone.