Benzenesulfonic acid, 4-methyl-, compd. with pyridine (1:1) → 2-[2-(5-Bromo-1H-indol-3-yl)ethyl]-3-{3-[(propan-2-yl)oxy]phenyl}quinazolin-4(3H)-one

Participants

Reaction Steps

A solution of 3-(2,2-dimethyl-4,6-dioxo-1,3-dioxane-5-yl)methyl-5-bromoindole (4.12 g, 12 mmol), 2-amino-N-(3-isopropoxyphenyl)benzamide (3.48 g, 13 mmol), and PPTS (1.64 g, 6.5 mmol) in 50 ml of pyridine was refluxed for 3.5 days. The reaction mixture was then evaporated in vacuo to dryness, and the residue was taken up in methylene chloride. The product was chromatographed (30% ethyl acetate/hexanes, SiO2) and the title product (2.13 g, 36%) crystallized by allowing the fractions containing product to evaporate: mp 179°-181° C.

Provenance & Evidence