@article{a00082c4eb994355abc397aaaf7247c3,
title = "Polyoxygenated coumarins. Oxonium ylides en route to polyoxa- macrocyclic coumarins",
abstract = "The overall sequence of Rh(II)-catalysed carbenoid generation, oxonium ylide formation and subsequent sigmatropic rearrangement utilising 3-diazo- 2H-1-benzopyran-2,4(3H)-dione in cyclic ethers as solvents has been satisfactorily used to achieve the synthesis of several medium- to large- membered polyoxa macrocycles embodying the coumarin subunit.",
keywords = "Carbene Ylides, Coumarins, Crown Ethers, Diazo Compounds",
author = "Sergio Cenini and Giancarlo Cravotto and Giovenzana, \{Giovanni B.\} and Giovanni Palmisano and Stefano Tollari",
note = "Funding Information: The financial support of this work from the Ministero dell'Universith e della Rieerca Scientifica e Tecnologica (MURST) (Progetto {"}Chimica dei composti organici di interesse biologico{"}; fondi ex-40\%) and CNR grant No.97,02514.CTD3 are gratefully acknowledged. We would like to thank Dr. L. Calabi (Bracco SpA, Milan) and Prof. R. Annunziata for NMR spectra.",
year = "1999",
month = may,
day = "21",
doi = "10.1016/S0040-4020(99)00291-4",
language = "English",
volume = "55",
pages = "6577--6584",
journal = "Tetrahedron",
issn = "0040-4020",
publisher = "Elsevier Ltd.",
number = "21",
}