Cy2NH·HX-promoted cyclizations of o-(alk-1-ynyl)benzoates and (Z)-alk-2-en-4-ynoate with copper halides to synthesize isocoumarins and α-pyrone

Article abstract of DOI:10.1055/s-2006-958960

Cy₂NH·HX was found to improve the cyclization reactions of o-(alk-1-ynyl)benzoates and (Z)-alk-2-en-4-ynoate with CuX₂ (X = Cl, Br) to synthesize the corresponding 4-haloisocoumarins and 5-bromo-2-pyrone, respectively. In the presenc