High regioselectivity in electrochemical α-methoxylation of N-protected cyclic amines
摘要:
N-Protecting groups of alpha-substituted cyclic amines strongly affected the regioselectivity in electrochemical methoxylation of these compounds. Namely, N-acyl derivatives were transformed into alpha'-methoxylated compounds, while N-cyano derivatives changed into alpha-methoxylated derivatives. Furthermore, Lewis acid catalyzed nucleophilic substitution of the alpha-methoxylated compounds protected with cyano group afforded alpha,alpha-disubstituted cyclic amines. (c) 2008 Elsevier Ltd. All rights reserved.
Electrochemical Deallylation of α-Allyl Cyclic Amines and Synthesis of Optically Active Quaternary Cyclic Amino Acids
作者:Peter G. Kirira、Masami Kuriyama、Osamu Onomura
DOI:10.1002/chem.200903512
日期:2010.4.6
Electrochemical oxidation of α‐allylated and α‐benzylated N‐acylated cyclic amines by using a graphite anode easily affords the corresponding α‐methoxylated products with up to 76 % yield. Ease of oxidation was affected by the type of electrode, the size of cyclic amine, and the nature of the protecting group. This method was successfully applied to the synthesis of optically active N‐acylated α‐alkyl‐α‐amino
An efficient solid-phase procedure for the synthesis of a number of 2-substituted piperidines is reported. Starting from solid-supported carbamate-tethered delta-amino acetals, 2-benzotriazolyl-substituted (Bt-substituted) piperidines were obtained by acid-induced ring-closure followed by trapping of the transient N-acyliminium ions with benzotriazole. These 2-Bt-substituted piperidines were then used as precursors for the successful introduction of several C-nucleophiles by N-acyliminium. ion chemistry. (C) Wiley-VCH Verlag GmbH, 69451 Weinheim, Germany, 2002.