A Mutually π-Facial Selective Cyclopropanation of Chiral Enamides Using Dirhodium(II) Carbenoids
作者:Ting Lu、Zhenlei Song、Richard P. Hsung
DOI:10.1021/ol702824s
日期:2008.2.1
A mutually pi-facial selective cyclopropanation of chiralenamides using dirhodium(II) carbenoids is described here. This work illustrates the influence of enamide substituents on stereoselectivity and reveals insights into this cyclopropanation.
Synthesis of amido-spiro[2.2]pentanes via Simmons–Smith cyclopropanation of allenamides
作者:Ting Lu、Ryuji Hayashi、Richard P. Hsung、Kyle A. DeKorver、Andrew G. Lohse、Zhenlei Song、Yu Tang
DOI:10.1039/b908205k
日期:——
Simmons–Smith cyclopropanations of allenamides en route to amido-spiro[2.2]pentanes is described here. While the diastereoselectivity was low when using unsubstituted allenamides, the reaction is overall efficient and general, representing the most direct synthesis of both chemically and biologically interesting amido-spiro[2.2]pentane systems. With α-substituted allenamides, while the diastereoselectivity
Stereoselective Simmons–Smith Cyclopropanation of Chiral Enamides
作者:Zhenlei Song、Ting Lu、Richard P. Hsung、Ziyad F. Al-Rashid、Changhong Ko、Yu Tang
DOI:10.1002/anie.200700681
日期:2007.5.25
A Highly Regio- and Stereoselective Synthesis of α-Fluorinated Imides via Fluorination of Chiral Enamides
作者:Yan-Shuang Xu、Yu Tang、He-Jing Feng、Ji-Tian Liu、Richard P. Hsung
DOI:10.1021/ol503591d
日期:2015.2.6
A highly π-facial selective and regioselective fluorination of chiralenamides is described. The reaction involves an enantioselective fluorination exclusively at the electron-rich enamide olefin with N–F reagents such as Selectfluor and N-fluoro-benzenesulfonimide [NFSI] accompanied by trapping of the β-fluoro-iminium cationic intermediate with water. The resulting N,O-hemiacetal could be oxidized
Chiral enamide. Part 1: Epoxidations of chiral enamides. A viable approach to chiral nitrogen stabilized oxyallyl cations in [4+3] cycloadditions
作者:Hui Xiong、Richard P. Hsung、Lichun Shen、Juliet M. Hahn
DOI:10.1016/s0040-4039(02)00849-3
日期:2002.6
The first study of stereoselectiveepoxidations of chiral enamides is described here. Its potential in the synthesis of chiral α-keto aminals as a viable approach to nitrogen stabilized oxyallylcations in stereoselective [4+3] cycloadditions is also illustrated.