An Efficient One-Pot Synthesis Of Dialkyl 3<i>H</i>-Naphtho[2,1,<i>b</i>]pyran-2,3-dicarboxylates Mediated by Vinyl Triphenylphosphonium Salt∗
作者:Issa Yavari、Ali Ramazani
DOI:10.1080/00397919708006068
日期:1997.4
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. ∗Dedicated to Professor Abbas Shafiee on the anniversary of his
A Facile Route to the Synthesis of New 2,3-Disubstituted Benzocoumarins
作者:Kamal M. El-Shaieb、Raafat M. Shaker、Ashraf A. Aly
DOI:10.1080/00397910801997850
日期:2008.5.23
Abstract Triphenylphosphine catalyzes the reaction between 2-hydroxy-1-naphthaldehyde and π-deficient acetylenes to give the newly prepared benzo[f]chromenes. The mechanism for the formation of products is discussed.