Samarium Diiodide-Induced Asymmetric Synthesis of Optically Pure Unsymmetrical Vicinal Diamines by Reductive Cross-Coupling of Nitrones with <i>N</i>-<i>tert</i>-Butanesulfinyl Imines
作者:Yu-Wu Zhong、Ming-Hua Xu、Guo-Qiang Lin
DOI:10.1021/ol048444d
日期:2004.10.1
[reaction: see text] An efficient method for the preparation of opticallypure unsymmetrical vicinal diamines by the SmI(2)-induced reductive cross-coupling of nitrones with chiral N-tert-butanesulfinyl imines was developed. This is the first successful example of the highly diastereoselective and enantioselective cross-coupling between two different imine species. It provides a straightforward access
Diastereoselective and Enantioselective Rh(I)-Catalyzed Additions of Arylboronic Acids to <i>N</i>-<i>tert</i>-Butanesulfinyl and <i>N</i>-Diphenylphosphinoyl Aldimines
作者:Daniel J. Weix、Yili Shi、Jonathan A. Ellman
DOI:10.1021/ja044003d
日期:2005.2.1
Twonew Rh(I)-catalyzed methods for the synthesis of chiral alpha-branched amines via addition of arylboronic acids to N-tert-butanesulfinyl and N-diphenylphosphinoyl imines have been developed. The syntheses are more functional group tolerant than alternative methods utilizing Grignard or organolithium reagents, and the imine activating groups used are easily removed. These methods are both high-yielding
the highly diastereoselective synthesis of chiral homoallylic amines by Zn-mediated allylation of chiral N-tert-butanesulfinyl imines at room temperature was developed. By simply tuning the reaction conditions, the method allows the achievement of a highly remarkable opposite stereocontrol, affording the desired stereochemical outcome in good yield and with excellent diastereoselectivity (up to 98%
Highly Diastereoselective and Enantioselective Synthesis of Enantiopure <i>C</i><sub>2</sub>-Symmetrical Vicinal Diamines by Reductive Homocoupling of Chiral <i>N-tert-</i>Butanesulfinyl Imines
作者:Yu-Wu Zhong、Kenji Izumi、Ming-Hua Xu、Guo-Qiang Lin
DOI:10.1021/ol0479803
日期:2004.12.1
[reaction: see text] An efficient and straightforward method for the preparation of highly enantiomerically enriched C2-symmetrical vicinaldiamines by the reductive homocoupling of aromatic N-tert-butanesulfinyl imines in the presence of SmI2 and HMPA was developed. It gives access to a variety of enantiopure C2-symmetrical 1,2-diamines in a very mild and practical way.
Telluronium Salts Mediated Aziridination of Chiral <i>N</i>-<i>tert</i>-Butylsulfinylimines: Highly Stereoselective Synthesis of Optically Active Vinylaziridines
作者:Jun-Cheng Zheng、Wei-Wei Liao、Xiao-Xia Sun、Xiu-Li Sun、Yong Tang、Li-Xin Dai、Jin-Geng Deng
DOI:10.1021/ol051921n
日期:2005.12.1
[reaction: see text] Optically active cis-2-substituted vinylaziridines are synthesized by the reaction of N-tert-butylsulfinylimines with telluroniumylides with excellent diastereoselectivity in good to excellent yields.