Ds. Black et al., SYNTHESIS OF 7-INDOLYL-IMINES BY THE REACTION OF 4,6-DIMETHOXYINDOLESWITH SECONDARY AMIDES AND PHOSPHORYL CHLORIDE, Tetrahedron, 52(13), 1996, pp. 4687-4696
4,6-Dimethoxy-2,3-diphenylindole 1 undergoes reaction with formanilide
, acetanilide, benzanilide and several dimethoxy analogs in the presen
ce of phosphoryl chloride to give the corresponding 7-imino derivative
s 2-6. This reaction has been extended to include the synthesis of 7-i
ndolyl-pyrrolines and tetrahydropyridines 7-9, 11 and oxazolines 14,15
.