Catalytic, asymmetric synthesis of α-phenoxy-β-aryl-β-lactams
摘要:
The reactions of phenoxyacetyl chloride with aryl imines in the presence of catalytic quantities of a silyl cinchona alkaloid and an achiral Lewis acid affords alpha-phenoxy-beta-aryl-beta-lactams. These reactions presumably proceed by way of ketene or acyl ammonium enolate intermediates. These reactions occur in a high enantioselectivity regardless of the nature of the Lewis acid, however, a high diastereoselectivity depended on the use of a hindered lanthanide complex as the Lewis acidic co-catalyst. (c) 2007 Elsevier Ltd. All rights reserved.
Cyanuric chloride is an inexpensive, efficient, and mild catalyst for the synthesis of N-sulfonyl imines by the reaction of sulfonamides with aryl aldehydes at 110 degrees C under solvent-free conditions. This method affords the N-sulfonyl imines in short reaction times, under solvent-free conditions, and in high yields.
Green, Catalyst-Free Protocol for the Efficient Synthesis of N-Sulfonyl Aldimines and Ketimines in Ionic Liquid [Bmim]Br
Sulfonamides are efficiently condensed with aldehydes as well as ketones in the absence of catalyst in 1-butyl-3-methylimidazolium bromide ([bmim]Br) under microwave irradiation to afford N-sulfonyl aldimines and ketimines in good to excellent yields in short reaction times.
DERKACH, N. YA.;BARASHENKOV, G. G.;SLYUSARENKO, E. I., ZH. ORGAN. XIMII, 1982, 18, N 1, 70-78
作者:DERKACH, N. YA.、BARASHENKOV, G. G.、SLYUSARENKO, E. I.
DOI:——
日期:——
NADDAKA, V. I.;AVANESYAN, K. V.;CHERKINSKAYA, M. L.;MINKIN, V. I., ZH. ORGAN. XIMII, 24,(1988) N 6, 1282-1284
作者:NADDAKA, V. I.、AVANESYAN, K. V.、CHERKINSKAYA, M. L.、MINKIN, V. I.
DOI:——
日期:——
NADDAKA, V. I.;AVANESYAN, K. V.;CHERKINSKAYA, M. L.;MINKIN, V. I., ZH. ORGAN. XIMII, 24,(1988) N 3, 603-607
作者:NADDAKA, V. I.、AVANESYAN, K. V.、CHERKINSKAYA, M. L.、MINKIN, V. I.