α-Amination of Nitrogen Heterocycles: Ring-Fused Aminals
摘要:
Aromatic aminoaldehydes react with cyclic amines to produce ring-fused aminals under thermal conditions. This process applied to two-step syntheses of the quinazolinone alkaloids deoxyvasicinone and rutaecarpine.
Selective copper(II) acetate and potassium iodide catalyzed oxidation of aminals to dihydroquinazoline and quinazolinone alkaloids
作者:Matthew T Richers、Chenfei Zhao、Daniel Seidel
DOI:10.3762/bjoc.9.135
日期:——
acetate/acetic acid/O2 and potassium iodide/tert-butylhydroperoxide systems are shown to affect the selective oxidation of ring-fused aminals to dihydroquinazolines and quinazolinones, respectively. These methods enable the facile preparation of a number of quinazoline alkaloid natural products and their analogues.
[EN] GROUP OF TETRAHYDROINDOLOQUINAZOLINE COMPOUNDS AND USE THEREOF<br/>[FR] GROUPE DE COMPOSÉS DE TÉTRAHYDROINDOLOQUINAZOLINE ET LEUR UTILISATION<br/>[ZH] 一组四氢吲哚并喹唑啉类化合物及其应用
Rutaecarpine is the major alkaloid component of Wu-Chu-Yu, a well known Chinese herbal drug. It has been reported that rutaecarpine causes the vasodilator, hypotensive effects by stimulation of CGRP synthesis and release via activation of TRPV1. In present study, 23 rutaecarpine analogues were designed and synthesized. Then, the vasodilator effects of theses compounds were screened by rat aortic ring experiment. The result showed that the 14-N atom of rutaecarpine might be the key site for the activity. The 5-carbonyl might make lower contribution to the effect. And simple substitute in indole-ring or quinazo-line-ring would not enhance the vasodilator effect unless in proper position with proper group. One of these compounds, 10-methylrutaecarpine, exhibited similar effect with rutaecarpine. Further functional experiments showed its vasodilator and hypotensive effect were related to the stimulation of CGRP release via activation of TRPV1. The vasodilator effects of these compounds were evaluated and the structure-activity relationship was elucidated for the first time. The results suggested a new direction of valuable TRPV1 agonist as anti-hypertensive drugs. (C) 2009 Elsevier Ltd. All rights reserved.
α-Amination of Nitrogen Heterocycles: Ring-Fused Aminals
作者:Chen Zhang、Chandra Kanta De、Rudrajit Mal、Daniel Seidel
DOI:10.1021/ja077473r
日期:2008.1.1
Aromatic aminoaldehydes react with cyclic amines to produce ring-fused aminals under thermal conditions. This process applied to two-step syntheses of the quinazolinone alkaloids deoxyvasicinone and rutaecarpine.