1967
DOI: 10.1002/cber.19671000235
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Zur Stokvis‐Reaktion (SR), 14. Methylen‐pyrrolone

Abstract: Aus Glyoxylshre und A3-Pyrrolonen-(2) erhalt man Carboxymethylen-pyrrolone (1 a-c). Diese k6nnen durch Bromierung in Monound Dibrommethylen-pyrrolone (3 bzw. 5a-c) und durch Nitrierung in Nitromethylen-pyrrolone (6ac) iibergefiihrt werden. Reduktion von 3.4-Dimethyl-brommethylen-pyrrolon oder Decarboxylierung von 3.4-Dimethyl-carboxymethylen-pyrrolon ergibt das 3.4-Dimethyl-5-methylen-A3-pyrrolon-(2) (7).

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Cited by 10 publications
(1 citation statement)
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“…(20 ' 159) The reaction of the pyrrolin-3-one (C32) with butane-1,3-dione in the presence of an acidic catalyst is reported as giving the pyrrolopyrylium salt (Cl 12), but the compound has not been fully characterized. Reduction of the bromo compound with zinc in acetic acid gives the parent 5-methylene A 3 -pyrrolin-2-one (C121) (X = H).< 196 ( The course of the corresponding reactions of aldehydes and ketones with pyrrolin-2-ones, having an unsubstituted ring position, depends upon the position of the double bond, which is governed, to a large extent, by the orientation and electronic character of the ring substituents (see Section A).…”
Section: Reactions With Aldehydes and Ketonesmentioning
confidence: 99%
“…(20 ' 159) The reaction of the pyrrolin-3-one (C32) with butane-1,3-dione in the presence of an acidic catalyst is reported as giving the pyrrolopyrylium salt (Cl 12), but the compound has not been fully characterized. Reduction of the bromo compound with zinc in acetic acid gives the parent 5-methylene A 3 -pyrrolin-2-one (C121) (X = H).< 196 ( The course of the corresponding reactions of aldehydes and ketones with pyrrolin-2-ones, having an unsubstituted ring position, depends upon the position of the double bond, which is governed, to a large extent, by the orientation and electronic character of the ring substituents (see Section A).…”
Section: Reactions With Aldehydes and Ketonesmentioning
confidence: 99%