Highly selective Diels–Alder and Heck arylation reactions in a divergent synthesis of isoindolo- and pyrrolo-fused polycyclic indoles from 2-formylpyrrole
作者:Carlos H Escalante、Eder I Martínez-Mora、Carlos Espinoza-Hicks、Alejandro A Camacho-Dávila、Fernando R Ramos-Morales、Francisco Delgado、Joaquín Tamariz
DOI:10.3762/bjoc.16.113
日期:——
chemo- and stereoselective divergent synthesis of isoindolo- and pyrrolo-fused polycyclic indoles is herein described, starting from 2-formylpyrrole and employing Diels–Alder and Heck arylation reactions. 3-(N-Benzyl-2-pyrrolyl)acrylates and 4-(pyrrol-2-yl)butenones underwent a highly endo-Diels–Alder cycloaddition with maleimides to furnish octahydropyrrolo[3,4-e]indoles, which served as precursors in the
本文描述了异吲哚并和吡咯并稠合的多环吲哚的高度区域选择性、化学选择性和立体选择性发散合成,从2-甲酰吡咯开始并采用Diels-Alder和Heck芳基化反应。3-( N-苄基-2-吡咯基)丙烯酸酯和4-(吡咯-2-基)丁烯酮与马来酰亚胺进行高度内切狄尔斯-阿尔德环加成反应,得到八氢吡咯并[3,4- e ]吲哚,作为前体通过分子内 Heck 芳基化反应进行氮杂多环骨架的区域选择性合成。通过后一个反应,3-( N-苄基-2-吡咯基)丙烯酸酯产生3-(吡咯并[2,1- a ]异吲哚-3-基)丙烯酸酯。多环中间体的进一步氧化芳构化提供相应的多环吡咯并-异吲哚和异吲哚并-吡咯并-吲哚。通过计算内切/外切过渡态进行的立体选择性狄尔斯-阿尔德反应的理论研究揭示了非共价相互作用在控制内切立体控制中的帮助。
An empirical study of the effect of the variables in a flash vacuum pyrolysis (FVP) experiment
作者:Emma F. Duffy、Jonathan S. Foot、Hamish McNab、Andrew A. Milligan
DOI:10.1039/b410786c
日期:——
The effect of the variation of the experimental parameters on the conversion of precursor to products in a typical flashvacuumpyrolysis (FVP) experiment was investigated empirically. Temperature-conversion plots can be used to optimise FVP conditions and their mechanistic significance is exemplified. At a given temperature, the conversion can be increased by an increase in the background pressure
Gregory, Barrie; Hinz, Werner; Jones, R. Alan, Journal of Chemical Research, Miniprint, 1984, # 10, p. 2801 - 2821
作者:Gregory, Barrie、Hinz, Werner、Jones, R. Alan、Arques, Jose Sepulveda
DOI:——
日期:——
Synthesis of pyrrolizin-3-ones by flash vacuum pyrolysis of pyrrol-2-ylmethylidene Meldrum’s acid derivatives and 3-(pyrrol-2-yl)propenoic esters
作者:Shirley E. Campbell、Murray C. Comer、Paul A. Derbyshire、Xavier L. M. Despinoy、Hamish McNab、Roderick Morrison、Craig C. Sommerville、Craig Thornley
DOI:10.1039/a701749i
日期:——
Monosubstituted pyrrolizin-3-ones 1 with substituents at the 1-, 5-,
6- or 7-positions are prepared in excellent yield by flash vacuum
pyrolysis (FVP) of appropriate Meldrumâs acid derivatives 2. The
mechanism involves formation of the pyrrol-2-ylmethylideneketene 29,
which can also be generated thermally from 3-(pyrrol-2-yl)propenoate
esters (e.g. 30). This alternative route has been used to make
a range of 2-substituted pyrrolizin-3-ones, again in excellent yield.
The 3-oxo-3H-pyrrolizine-2-carboxylic acid 42 could not be made
in this way owing to facile decarboxylation to pyrrolizinone 1, and
extension to the formation of the azaazulenone 48 was again
unsuccessful.
Pyrrolizine-3-ones: Synthesis and evaluation of photophysical properties
作者:Dilek Isik Tasgin、Irem Bayraktar
DOI:10.1080/00397911.2023.2292699
日期:2024.2
We describe a synthetic approach for pyrrolizine-3-one derivatives and their photophysical properties. These compounds are prepared by a series of reactions employing the substituted pyrroles in on...