Cyclisation of Aminyl Radicals Derived from Amino Acids
摘要:
alpha-Amino acid aminyl radicals have been generated from sulfenamide precursors using Bu3SnH. The aminyl radicals undergo 5-exo-trig cyclisation reactions onto suitably placed N-alkenyl or alpha-alkenyl chains on the amino acids with reasonable diastereoselectivity. The alpha-ester of the amino acid imparts electrophilic behaviour to the aminyl radicals and facilitates cyclisation onto alkenes. (C) 1997 Elsevier Science Ltd.
Cesium Effect: High Chemoselectivity in Direct N-Alkylation of Amines
作者:Ralph Nicholas Salvatore、Advait S. Nagle、Kyung Woon Jung
DOI:10.1021/jo010643c
日期:2002.2.1
A novel method for the mono-N-alkylation of primary amines, diamines, and polyamines was developed using cesium bases in order to prepare secondaryamines efficiently. A cesium base not only promoted alkylation of primary amines but also suppressed overalkylations of the produced secondaryamines. Various amines, alkyl bromides, and alkyl sulfonates were examined, and the results demonstrated this
Cyclisation of Aminyl Radicals Derived from Amino Acids
作者:W.Russell Bowman、Michael J Broadhurst、Daniel R Coghlan、Kirk A Lewis
DOI:10.1016/s0040-4039(97)01413-5
日期:1997.9
alpha-Amino acid aminyl radicals have been generated from sulfenamide precursors using Bu3SnH. The aminyl radicals undergo 5-exo-trig cyclisation reactions onto suitably placed N-alkenyl or alpha-alkenyl chains on the amino acids with reasonable diastereoselectivity. The alpha-ester of the amino acid imparts electrophilic behaviour to the aminyl radicals and facilitates cyclisation onto alkenes. (C) 1997 Elsevier Science Ltd.
A facile method for the N-alkylation of α-amino esters