A modular synthesis of polyfunctional dipyrrolemethanes is presented. Diverse side chains are introduced to 2-carboxypyrrole building blocks in two to four steps, resulting in a collection of substituted pyrroles that, when condensed in one step, give rise to diverse structural features.
A modular synthesis of polyfunctional dipyrrolemethanes is presented. Diverse side chains are introduced to 2-carboxypyrrole building blocks in two to four steps, resulting in a collection of substituted pyrroles that, when condensed in one step, give rise to diverse structural features.
Catalytic Chemo- and Regioselective Coupling of 1,3-Dicarbonyls with <i>N</i>-Heterocyclic Nucleophiles
作者:Miles Kenny、Daniel J. Kitson、Vilius Franckevičius
DOI:10.1021/acs.joc.6b00731
日期:2016.6.17
compounds with indole, pyrrole, imidazole, and pyrazole nucleophiles via an allylic linker under neutral conditions is disclosed. This process enables the installation of an all-carbon quaternary center and new C–C and C–N bonds in a single operation. Despite the weakly acidic nature of N-heterocycles, the reactions proceed with good efficiency and complete regio- and chemoselectivity.
Pyrrole aus 3-Alkoxyacroleinen und CH-aciden α-Aminoessigsäure-Derivaten
作者:Gul Hassan Walizei、Eberhard Breitmaier
DOI:10.1055/s-1989-27249
日期:——
Pyrroles from 3-Alkoxyacroleins and CH-acidic α-Aminoacetic Acid Derivatives 2-Alkoxycarbonylpyrroles and 2-cyanopyrroles 4 are prepared in a one-step synthesis by vinylogous amidation of 3-alkoxyacroleins 1 with glycine ester 2a-c and aminoacetonitrile (2d), followed by basecatalyzed cyclodehydration of the intermediate 3-aminoacroleins 3. The 3-hydroxypropyl function can be introduced into the pyrrole ring by using 3,4-dihyrdo-2H-pyran-5-carbaldehyde (5) as a cyclic 3-alkoxyacrolein.
The Grignard, Wittig, Tebbe, Horner–Emmons, and Reformatsky reactions of the 4-oxoproline esters gave the corresponding 4-alylated or 4-alkylidenated products, respectively. The products were properly treated with bases to cause aromatization, giving 4-substituted pyrrole-2-carboxylic acid esters such as methyl 4-methylpyrrole-2-carboxylate, which is a trail pheromone of Atta texana.
WALIZEI, GUL HASSAN;BREITMAIER, EBERHARD, SYNTHESIS,(1989) N, C. 337-340
作者:WALIZEI, GUL HASSAN、BREITMAIER, EBERHARD
DOI:——
日期:——
Modular Preparation of Diverse Dipyrrolemethanes
作者:Michael Schramm、Cindy Pham、Michelle Park、Jenny Pham、Sadie Martin
DOI:10.1055/s-0032-1318503
日期:——
A modular synthesis of polyfunctional dipyrrolemethanes is presented. Diverse side chains are introduced to 2-carboxypyrrole building blocks in two to four steps, resulting in a collection of substituted pyrroles that, when condensed in one step, give rise to diverse structural features.