A Versatile and Highly Stereoselective Synthesis of Diethyl (1-Aminoalkyl)thiophosphonates
作者:Chengye Yuan、Zhilong Chen、Jinfeng Li
DOI:10.1055/s-0029-1217054
日期:2009.12
excellent enantioselectivity by nucleophilic addition of diethyl thiophosphonate to N-(tert-butylsulfinyl)imines under mild conditions. There is no evidence indicating that the reaction is influenced by electronic or steric effects of the substrates. nucleophilic additions - thiophosphonates - imines - sulfinamides - sulfonamides
2-Pyridylsulfinamides as effective catalysts in the asymmetric alkylation of aldehydes with diethylzinc
作者:Kavirayani R. Prasad、Omkar Revu
DOI:10.1016/j.tet.2013.07.061
日期:2013.9
Chiral 2-pyridylsulfinamides were shown to be effective catalysts in the alkylation of aryl and alkyl aldehydes with diethylzinc providing the corresponding alcohols in excellent enantioselectivity. Sulfinamide catalysts possessing solitary chirality at the sulfur center produced the product phenethyl alcohol in good enantioselectivity. Diastereomeric sulfinamides possessing chirality at the carbon-bearing nitrogen and at the sulfur of the sulfinamide increased the enantioselectivity of the product alcohols up to >99%. However, there is no effect of the match-mismatch pair of sulfinamide diastereomers on the outcome of the chiral induction of the product phenethyl alcohols. It was conclusively proved that chirality at the sulfur center is mandatory for obtaining good enantioselectivity in the reaction. (C) 2013 Elsevier Ltd. All rights reserved.