T. Okawa et al., CHEMOSELECTIVITY IN THE INTRAMOLECULAR AZA-WITTIG REACTION OF N-[2-(TRISUBSTITUTED ANYLIDENE)AMINOBENZOYL]-2-PYRROLIDONE-5-CARBOXYLIC ACID-DERIVATIVES, Heterocycles, 47(1), 1998, pp. 375-382
The intramolecular aza-Wittig reaction of (5S)-N-[2-(trisubstituted an
ylidene)aminobenzoyl]-2-pyrrolidone-5-carboxylic acid derivatives gave
chemoselectively pyrrolo[2,1-c][1,4]benzodiazepin derivatives or pyrr
olo[2,1-b]quinazoline derivatives depending on their substituents and
phosphorus reagent.