A concise synthesis of monoazaporphyrin from 1,19-dideoxybiladiene-ac
摘要:
1, 19-Dideoxybiladiene-ac was found to be cyclized into monoazaporphyrin in 18-33% yield in the presence of iodine/potassium iodide mixture and ammonium hydroxide or sodium azide as the nitrogen source. The synthesis circumvents the tedious preparation of 1,19-dibromobiladiene-ac for monoazaporphyrin. (c) 2008 Elsevier Ltd. All rights reserved.
New syntheses of biliverdins, corroles and azaporphyrins from 1,19-dibromo-ac-biladiene salts
作者:Ravindra K. Pandey、Kevin R. Gerzevske、Huanghai Zhou、Kevin M. Smith
DOI:10.1039/p19940000971
日期:——
readily available, 1,19 dibromo-ac-biladiene dihydrobromide salts 3 with dimethyl sulfoxide (DMSO) in presence of a catalytic amount of toluene-p-sulfonic acid affords symmetrical and unsymmetrical biliverdins 4 in excellent yield; unsymmetrically substituted 1,19 dibromo-ac-biladiene dihydrobromide 3c was prepared in a stepwise fashion via a tripyrrin salt. Under appropriate reaction conditions, the ac-biladiene
Stepwise synthesis of 1,19-dibromo-a,c-biladienes and their conversion into biliverdins, corroles and azaporphyrins
作者:Ravindra K. Pandey、Huanghai Zhou、Kevin Gerzevske、Kevin M. Smith
DOI:10.1039/c39920000183
日期:——
The first stepwise syntheses of unsymmetrically substituted 1,19-dibromo-a,c-biladienes, e.g.3c, via the so-called ‘tripyrrene route’, and their facile conversion into biliverdins (bilin-1,19-diones), e.g.4c, are described; this methodology is also adapted for the preparation of symmetrical biliverdins 4a, as well as corroles 5 and azaporphyrins 6.