microwave-assisted diversity-oriented domino synthesis of functionalized alkyl nicotinates from propargyl vinylethers is described. The domino manifold comprises a complex network of reactions involving at least five distinct chemical steps. The obtained alkyl nicotinates incorporate two diversity points at the ring and one ester functionality as convenient handles for further elaboration.
One-Pot Synthesis of 1,2-Dihydropyridines: Expanding the Diverse Reactivity of Propargyl Vinyl Ethers
作者:Tobias Harschneck、Stefan F. Kirsch
DOI:10.1021/jo102545m
日期:2011.4.1
The catalyzed synthesis of 1,2-dihydropyridines starting from easily accessible propargyl vinyl ethers was realized. The reaction sequence involving a transition metal-catalyzed propargyl-Claisen rearrangement, a condensation step, and a Brønsted acid-catalyzed heterocyclization furnishes the highly substituted heterocycles in moderate to excellent yields. Additionally, a practical one-pot protocol