2386-32-5Relevant academic research and scientific papers
PREPARATION OF 4,5-DIALKYL-3-ACYL-PYRROLE-2-CARBOXYLIC ACID DERIVATIVES BY FISCHER-FINK TYPE SYNTHESIS AND SUBSEQUENT ACYLATION
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Page/Page column 21-24, (2008/06/13)
The present invention relates to an improved synthesis of pyrrole capping group precursors of formula I-a: comprising: combining an aqueous solution of the compound of formula IV-a: wherein R3 is C1-12 aliphatic, C3-12 alkyl-cycloaliphatic, C3-12 alkyl-aryl, C3-12 alkyl-heteroaryl, or C3-12 alkyl-cycloaliphatic; with a compound of formula V-a, wherein R1 and R2 are each independently C1-6 aliphatic; in the presence of zinc, water, and optionally an additional suitable solvent to form a compound of formula VI.
A NEW METHOD FOR THE PRODUCTION OF PYRROLYLACETYLENES
Kozhich, D. T.,Vasilevskii, V. I.,Mironov, A. F.,Evstigneeva, R. P.
, p. 745 - 750 (2007/10/02)
A new method was developed for the production of a previously difficulty obtainable class of pyrroles, i.e., pyrrolylacetylenes.The method is based on the discovered reaction between alkyl pyrrolyl ketones and phosphorus oxychloride in dimethylformamide, as a result of which α-chloroalkenylpyrroles are formed.The latter are converted by the action of alkali into pyrrolylacetylenes with high yields.When twice the amount of phosphorus oxychloride is used α-chloro-β-formylvinylpyrroles are formed.The stereochemistry of these compounds was studied.
