Synthesis of Indoles by Domino Reaction of 2-(Tosylamino)benzyl Alcohols with Furfurylamines: Two Opposite Reactivity Modes of the α-Carbon of the Furan Ring in One Process
作者:Maxim G. Uchuskin、Natalia V. Molodtsova、Sergey A. Lysenko、Vladimir N. Strel'nikov、Igor V. Trushkov、Alexander V. Butin
DOI:10.1002/ejoc.201301762
日期:2014.4
An unusual dominoreaction where the same furanα-carbon atom reacts initially as a nucleophile and then as an electrophile is reported. In the presence of acid, N-tosylfurfurylamines react with 2-(tosylamino)benzylalcohols to afford 2-(2-acylvinyl)indoles. The reaction proceeds by Friedel–Crafts alkylation at the C(2) atom of furan followed by acid-catalyzed intramolecular nucleophilic attack of