M. Amat et al., A NEW SYNTHETIC ENTRY TO THE INDOLO[2,3-A]QUINOLIZIDINE SYSTEM - ELECTROPHILIC CYCLIZATIONS ON THE INDOLE RING FROM 2-(2-PIPERIDYL)INDOLES, Tetrahedron letters, 37(17), 1996, pp. 3071-3074
A new synthetic route to the indolo[2,3-a]quinolizidine system, involv
ing the Pd(0)-catalyzed cross-coupling of a 2-indolylzinc derivative w
ith a 2-halopyridine, stereoselective hydrogenation of the pyridine ri
ng, and electrophilic cyclization upon the indole 3-position from the
resulting 2-(2-piperidyl)indole, is reported. (C) 1996 Elsevier Scienc
e Ltd.