Stereoselective Synthesis of Di- and Monofluoromethylated Vicinal Ethylenediamines with Di- and Monofluoromethyl Sulfones
作者:Jun Liu、Ya Li、Jinbo Hu
DOI:10.1021/jo070094w
日期:2007.4.1
The diastereoselective nucleophilic (phenylsulfonyl)difluoromethylation and (phenylsulfonyl)monofluoromethylation of α-amino N-tert-butanesulfinimines (3) by using PhSO2CF2H and PhSO2CH2F reagents gave products 4 or 5 in high yields (73−99%) and with excellent diastereoselectivity (dr up to >99:1). After subsequent reductive desulfonylation and acid-catalyzed alcoholysis, compounds 4 and 5 could be
Stereoselective Synthesis of Trifluoromethylated Vicinal Ethylenediamines with α-Amino <i>N</i>-<i>tert</i>-Butanesulfinimines and TMSCF<sub>3</sub>
作者:G. K. Surya Prakash、Mihirbaran Mandal
DOI:10.1021/ja020482+
日期:2002.6.1
from alpha-amino acids) with Ellman's (R)-N-tert-butanesufinamide without any racemization, and these were trifluoromethylated with TMSCF3 and TMAF (tetramethylammonium fluoride) to the corresponding vicinal ethylenediamines derivatives. Imines derived from l-amino acids gave exclusively one diastereomer with a very high yield.