The triazene moiety as a protecting group for aromatic amines
摘要:
Reaction of (2-,(3-, and (4-bromophenyl)-3,3-(1,4-butanediyl)triazenes (derived from the corresponding 2-, 3-, and 4-bromoanilines) with sec- or tert-butyllithiums gave the corresponding (triazenylaryl)-lithiums; these intermediates reacted with a variety of electrophiles to give substituted aryl triazenes. These products cound be converted to substituted anilines by reduction or to novel substituted aromatics by a modified Sandmeyer reaction.
Evolution of a Synthetic Strategy: Total Synthesis of (±)-Welwitindolinone A Isonitrile
作者:Sarah E. Reisman、Joseph M. Ready、Matthew M. Weiss、Atsushi Hasuoka、Makoto Hirata、Kazuhiko Tamaki、Timo V. Ovaska、Catherine J. Smith、John L. Wood
DOI:10.1021/ja076663z
日期:2008.2.1
An efficient and highly stereoselective total synthesis of the natural product (+/-)-welwitindolinone A isonitrile (1) is described. The bicyclo[4.2.0]octane core of 1 was established by a regio- and diastereoselective [2+2] ketene cycloaddition. The C12 quaternary center and vicinal stereogenic chlorine were installed in a single operation with excellent stereocontrol via a chloronium ion mediated
Rh(III)-catalyzed aromatic C–H bond carbenoid functionalization of triazenes by α-diazomalonate
作者:Dahai Wang、Sunliang Cui
DOI:10.1016/j.tet.2015.06.024
日期:2016.6
A Rh(III)-catalyzed aromatic C-H bond carbenoid functionalization of triazenes by alpha-diazomalonates has been developed, with features of mild reaction condition and high efficiency. Furthermore, the functionalized triazenes could be subject to divergent synthesis. (C) 2015 Elsevier Ltd. All rights reserved.