Three-Step One-Pot Synthesis of Imidazo[2,1-b]chalcogenazoles via Intramolecular Cyclization of N-Alkynylimidazoles
作者:Juliano Alex Roehrs、Renan P. Pistoia、Davi F. Back、Gilson Zeni
DOI:10.1002/adsc.201200075
日期:2012.6.18
Imidazo‐chalcogenazoles are easily accessible from the corresponding N‐alkynylimidazoles by a three‐step, one‐pot chalcogenation reaction. The generality of this reaction has been established with various substituted N‐alkynylimidazoles as well as elemental chalcogens. By accessing the key intermediate 2‐chalcogenolate‐N‐alkynylimidazole it was also possible to prepare dichalcogenide derivatives.
Preparation of (<i>Z</i>)-α,β-Disubstituted Enamides via Palladium-Catalyzed Addition of Boronic Acids to Ynamides
作者:Yuanfa Yang、Lina Wang、Fang Zhang、Gangguo Zhu
DOI:10.1021/jo501894j
日期:2014.10.3
Pd-catalyzed, highly regio- and stereoselective addition of boronic acids to ynamides has been realized. This protocol generates (Z)-α,β-disubstituted enamides in high yields with excellent regio- and stereoselectivity under the mild reaction conditions, thereby providing a good complementary method for the diverse synthesis of multifunctional enamides. A wide collection of functional groups are found