Halocyclization of o-(alkynyl)styrenes. Synthesis of 3-halo-1H-indenes
作者:Roberto Sanz、Alberto Martínez、Patricia García-García、Manuel A. Fernández-Rodríguez、Muhammad A. Rashid、Félix Rodríguez
DOI:10.1039/c0cc02590a
日期:——
o-(Alkynyl)styrenes undergo halocarbocyclization processes via a 5-endo-dig ring closure. By this strategy an efficient synthesis of 3-halo-1H-indene derivatives has been developed.
were evaluated as catalysts for halocarbocyclization reactions of alkynylstyrenes and a cinnamylaniline derivative. Phosphines and phosphorus chalcogenides exhibited high activity for the conversion of alkynylstyrenes in the presence of N-halosuccinimides with up to a 30-fold increase of the initial reaction rate with respect to the background reaction. Phosphorus sulfides and selenides showed the best