Boese, Roland; Knoelker, Hans Joachim; Vollhardt, K. Peter C.:
Cobalt-mediated [2+2+2]-cycloaddition of alkynes to imidazole to form 3a,7a-dihydrobenzimidazoles and a novel synthesis of quinolines.
1987
In: Angewandte Chemie, Jg. 99 (1987), Heft 10, S. 1067 - 1068
Artikel/Aufsatz in Zeitschrift1987Chemie
Titel:
Cobalt-mediated [2+2+2]-cycloaddition of alkynes to imidazole to form 3a,7a-dihydrobenzimidazoles and a novel synthesis of quinolines.
Autor(in):
Boese, RolandLSF; Knoelker, Hans Joachim; Vollhardt, K. Peter C.
Erscheinungsjahr
1987

Abstract:

The Co complexes I (R = SiMe3, Et, OMe, CO2Me, X = O) were obtained as pure antiisomers by reaction of the alkylnylimidazole II with RC.tplbond.CSiMe3 and cyclopertadienylcobalt dicarbonyl. I (R = SiMe3, X = H2) was similarly obtained as a syn-anti mixt. I (R = SiMe3, X = O) was demetalated or desilylated to I (R = H, X = O). Demetalation, aromatization, and imine hydrolysis of I (R = OMe, X = O) gave the quinolinone III.