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
Synthesis of optically active ene carbamates from chromium carbene complexes: use in palladium(II)-assisted synthesis of relays to (+)-thienamycin
作者:John Montgomery、Gary M. Wieber、Louis S. Hegedus
DOI:10.1021/ja00173a012
日期:1990.8
prepare opticallyactivechromium carbene complexes containing the oxazolidinone moiety led instead to an efficient and general synthesis of opticallyactive ene carbamates. One of these has been subjected to palladium(II)-assisted carboacylation, and complete control of stereochemistry was observed. This compound was converted to a key relay to (+)-thienamycin in good chemical and very high optical yield
尝试制备含有恶唑烷酮部分的光学活性铬卡宾配合物,反而导致了光学活性烯氨基甲酸酯的有效和通用合成。其中之一已进行钯 (II) 辅助的碳酰化,并观察到立体化学的完全控制。该化合物以良好的化学和非常高的光学产率转化为 (+)-硫霉素的关键中继
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
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.