Electroreduction of aromatic imines in the presence of electrophiles gave the corresponding inter- and intramolecular coupling products when the reaction was carried out with the use of chlorotrimethylsilane (CTMS) as the trapping agent of an anion intermediate.
Synthesis in dry media coupled with microwave irradiation: Application to the preparation of β-aminoesters and β-lactams via silyl ketene acetals and aldimines.
According to the reaction conditions, silyl keteneacetals react with aldimines to give β-aminoesters (montmorillonite clay K10, or para-toluenesulfonic acid) or β-lactams (KF/18 crown-6) in a few minutes under microwave irradiation.
作者:Ronald Grigg、James Kemp、John F. Malone、Shuleewan Rajviroongit、Tangthongkum Anant
DOI:10.1016/s0040-4020(01)86043-9
日期:1988.1
Imines of α-aminoacidesters undergo regiospecific Michael addition to methyl acrylate or acrylonitrile in good yield in benzene at 25°C catalysed by benzyItrimethyl ammonium methoxide (BTAM). The Michael adducts cyclise to a mixture of two stereoisomeric polysubstituted proline esterderivatives in the presence of 1 mol. of BTAM. Mechanistic studies, involving chiral intermediates, show this cyclisation
A one-pot selective synthesis of N-Boc protected secondary amines: tandem direct reductive amination/N-Boc protection
作者:Raghupathi Neelarapu、Pavel A. Petukhov
DOI:10.1016/j.tet.2012.06.055
日期:2012.9
A one-pot tandem direct reductive amination of aldehydes with primary amines resulting in N-Boc secondary amines using a (Boc)(2)O/sodium triacetoxyborohydride (STAB) system is reported. The tandem procedure is efficient, selective, and versatile, giving excellent yields of N-Boc protected secondary amines even in those cases where the products are prone to intramolecular lactamization. (C) 2012 Elsevier Ltd. All rights reserved.