Highly Stereoselective and Practical Synthesis of α-Trichloromethyl Amines and 2,2-Dichloroaziridines from Chloroform
作者:Ya Li、Tao Zheng、Wei Wang、Wei Xu、Yingchao Ma、Sishi Zhang、Han Wang、Zhihua Sun
DOI:10.1002/adsc.201100713
日期:2012.2
A highly stereoselective and practical synthesis of α-trichloromethyl amines by nucleophilic trichloromethylation of N-(tert-butylsulfinyl)imines with chloroform was achieved. The obtained α-trichloromethyl amines can be further transformed into chiral 2,2-dichloroaziridines through an intramolecular nucleophilic substitution methodology. 2,2-Dichloroaziridines can also be produced directly from chloroform
Highly Stereoselective Trichloromethylation of N-(tert-Butylsulfinyl)aldimines: Facile Synthesis of Chiral α-Trichloromethylamines
作者:Ya Li、Yunlv Cao、Jiaying Gu、Wei Wang、Han Wang、Tao Zheng、Zhihua Sun
DOI:10.1002/ejoc.201001495
日期:2011.2
The first highly stereoselective and facile synthesis of α-trichloromethylamines is described by using a nucleophilic trichloromethylation strategy. With tetrabutylammonium triphenyldifluorosilicate (TBAT) as the mediator, the trichloromethyl anion (CCl 3 ― ) from TMSCCl 3 can be transferred to N-(tert-butylsulfinyl)aldimines in excellent yields and with high diastereoselectivity (≥99:1 dr).
room temperature gave α-chloro cis-aziridines. Additionally, with Bu3SnH as the reductant, α-(dichloromethyl)amines were readily obtained from easily accessible α-(trichloromethyl)amines via mono-dechlorination. Over-reduction was successfully suppressed. Subsequent radical mono-dechlorination of the α-(dichloromethyl)amines gave the corresponding α-(chloromethyl)amines in good to excellent yields