PPh<sub>3</sub>-KOBu<sup>t</sup>–Mediated Cyclization Reaction of <font>β</font>-Ketoesters with Alkynyl Ketones: Synthesis of Functionalized 2-Pyrones
Abstract Cyclization of alkynyl ketones with β-ketoesters mediated by PPh3 and KOBut to synthesize 2-pyrone derivatives was systematically described. A variety of β-ketoesters reacted with alkynyl ketones to give functionalized 2-pyrones in moderate to good yields under mild conditions.