An Efficient One-Pot Synthesis Of Dialkyl 3H-Naphtho[2,1,b]pyran-2,3-dicarboxylates Mediated by Vinyl Triphenylphosphonium Salt∗
- 1 April 1997
- journal article
- research article
- Published by Taylor & Francis in Synthetic Communications
- Vol. 27 (8) , 1385-1390
- https://doi.org/10.1080/00397919708006068
Abstract
Protonation of the reactive intermediates produced in the reaction between dialkyl acetylenedicarboxylates and triphenylphosphine by 2-hydroxy-1-naphthaldehyde leads to vinyltriphenylphosphonium salts, which undergo intramolecular Wittig reaction to produce dialkyl 3H-naphtho[2,1-b]pyran-2,3-dicarboxylates in fairly high yields.Keywords
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