Three-Component Tandem-Intramolecular Hydroamination Reactions in One Pot Involving Indoles, 2-Aminobenzyl Alcohols, and 2-Alkynylbenzaldehydes: Consecutive 7-<i>endo</i>-<i>trig</i>and Electrophilic 6-<i>endo</i>-<i>dig</i>Cyclizations
作者:Srinivas Samala、Mohammad Saifuddin、Anil K. Mandadapu、Bijoy Kundu
DOI:10.1002/ejoc.201300100
日期:2013.6
A one-pot protocol for the synthesis of indole-based annulated polyheterocycles involvingconsecutive 7-endo-trig and electrophilic 6-endo-dig cyclizations is described. The reaction proceeds initially through annulation of 5-methoxyindole, 2-amino benzyl alcohol and 2-alkynylbenzaldehyde
Application of 7-<i>endo</i>-<i>trig</i>Pictet-Spengler Cyclization to the Formation of the Benzazepine Ring: Synthesis of Benzazepinoindoles
作者:Sudhir K. Sharma、Sunil Sharma、Piyush K. Agarwal、Bijoy Kundu
DOI:10.1002/ejoc.200801201
日期:2009.3
The preparation of benzazepinoindoles, fused heterocycles with a benzazepine moiety, was accomplished through an intramolecular 7-endo-trig Pictet–Spengler cyclization. The precursors comprising C-3- or C-2-linked o-aminobenzylindoles required for the cyclization were obtained either by treating indoles with o-nitrobenzyl bromide followed by reduction of the nitro group or by treating 2-nitrophenylacetic