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.
Rhodium-Catalyzed Intramolecular C−H Bond Activation with Triazoles: Preparation of Stereodefined Pyrrolidines and Other Related Cyclic Compounds
On treatment of triazoles having an N‐sulfonyl‐protected benzylamine moiety with [Rh2(C7H15CO2)4], intramolecular C−H bond insertion takes place at the benzylic position to give cis‐N‐sulfonyl‐2‐aryl‐3‐[(sulfonylimino)methyl]pyrrolidines in good yields and with highly stereoselectivities. Analogously, the similar treatment of triazoles having an ether or even an alkyl moiety affords 2‐alkyl‐ or 2‐
治疗上具有三唑Ñ用的[Rh磺酰基保护的苄胺部分2(C 7 ħ 15 CO 2)4 ],分子内C-H键的插入发生在苄基位置,得到顺式- ñ -磺酰基-2-芳基-3-[(磺酰亚胺基)甲基]吡咯烷酮收率高且立体选择性高。类似地,对具有醚或什至烷基部分的三唑进行类似处理,得到2-烷基-或2-芳基-3-[[磺酰亚胺聚合物)甲基]四氢呋喃或2-烷基-3-[[磺酰亚胺聚合物]甲基]环戊烷。良品率高。