Asymmetric Synthesis of Aziridines by Reduction of <i>N-tert</i>-Butanesulfinyl α<i>-</i>Chloro Imines
作者:Bram Denolf、Erika Leemans、Norbert De Kimpe
DOI:10.1021/jo0624795
日期:2007.4.1
Reduction of (RS)-N-tert-butanesulfinyl α-halo imines afforded chiral aziridines in good to excellent yields. Upon reduction of (RS)-N-tert-butanesulfinyl α-halo imines with NaBH4 in THF, in the presence of 10 equiv of MeOH, (RS,S)-β-halo sulfinamides were formed in excellent yield (up to 98%) with very good stereoselectivity (>98:2). Simple treatment of the latter (RS,S)-β-halo-tert-butanesulfinamides
Asymmetric Synthesis of Cyclopropylamines Starting from <i>N</i>-Sulfinyl α-Chloro Ketimines
作者:Bram Denolf、Sven Mangelinckx、Karl W. Törnroos、Norbert De Kimpe
DOI:10.1021/ol0622054
日期:2007.1.1
of chiral N-(1-substituted cyclopropyl)-tert-butanesulfinamides in acceptable to good yields and diastereoselectivity via 1,3-dehydrohalogenation and subsequent addition of the Grignard reagent to the intermediate cyclopropylideneamine. Only in the case of allylmagnesium chloride did the reaction lead to aziridines in high yield. Further deprotection toward N-unprotected 1-substituted cyclopropylamines