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Interaction of diazoacetic esters with silyl-substituted acetylenes and the production of 1-H- and 1,2-di-H-cyclopropene-3-carboxylic acids and their esters

โœ Scribed by I. E. Dolgii; G. P. Okonnishnikova; O. M. Nefedov


Book ID
112438474
Publisher
Springer
Year
1979
Tongue
English
Weight
470 KB
Volume
28
Category
Article
ISSN
1573-9171

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## Abstract C(ฮฑ)โ€Carboxylic acid esters were treated with excess lithium diisopropylamide, condensed with methyl salicylates or methyl thiosalicylate, followed by acid cyclization to either 4โ€hydroxyโ€3โ€substituted, 2__H__โ€1โ€benzopyranโ€2โ€ones (coumarins), or 2__H__โ€1โ€benzothiopyranโ€2โ€ones (thiocouma