Parameters for bromination of pyrroles in bromoperoxidase-catalyzed oxidations
作者:Diana Wischang、Jens Hartung
DOI:10.1016/j.tet.2011.04.010
日期:2011.6
Ester-, cyano-, and carboxamide-substituted 1H-pyrroles undergo electrophilic aromatic bromination, if treated with hydrogen peroxide and sodium bromide at pH 6.2 and 20 degrees C. Oxidation of bromide under such conditions is catalyzed by a vanadate(V)-dependent bromoperoxidase, in a substrate/enzyme ratio of 32-63 mu mol %. To obtain maximum yields of bromopyrroles (up to 91%) by spending least amount of substrates and catalyst, hydrogen peroxide and sodium bromide have to be added continuously to the enzyme and the 2-acceptor-substituted pyrrole (1.5 mmol) in a solution of morpholine-4-ethanesulfonic acid buffer. This technique was applied to prepare two marine natural products under biomimetic conditions, that is, methyl 4,5-dibromopyrrole-2-carboxylate (from Agelas oroides) and 4,5-dibromopyrrole-2-carboxamide (from Acanthella carteri). (C) 2011 Elsevier Ltd. All rights reserved.
Neisser, Chemische Berichte, 1934, vol. 67, p. 2080,2082
作者:Neisser
DOI:——
日期:——
Synthesis of 2-, 3- and 9-substituted 11-oxo-11H-pyrrolo[2,1-b][3]benzazepines
作者:Patrice C. Belanger、Joseph G. Atkinson、C. Stanley Rooney、Susan F. Britcher、David C. Remy