Synthesis of Substituted Furan/Pyrrole-3-carboxamides through a Tandem Nucleopalladation and Isocyanate Insertion
作者:Manda Rajesh、Surendra Puri、Ruchir Kant、Maddi Sridhar Reddy
DOI:10.1021/acs.orglett.6b02077
日期:2016.9.2
furanyl- and pyrrolyl-3-carboxamides from readily available 3-alkyne-1,2-diols and 1-amino-3-alkyn-2-ols using isocyanate as amido surrogate is demonstrated. The approach constitutes a successful unprecedented combination of heteropalladation and isocyanate insertion, a new avenue for novel amide bond constructions. The mechanism likely involves a 6-membered oxaaminopalladacycle as the key intermediate.
证明了使用异氰酸酯作为酰胺代用品可以从现成的3-炔基-1,2-二醇和1-氨基-3-炔基-2-醇中获得呋喃基和吡咯基3-羧酰胺。该方法构成了异palpalpalation和异氰酸酯插入成功的前所未有的组合,这是新型酰胺键结构的新途径。该机制可能涉及6元的oxaaminopalladacycle作为关键中间体。