Isobutanol → Terazosin

Participants

Reaction Steps

To a solution of iso-butanol (306 ml), water (34 ml) and N-(2-tetrahydrofuroyl)piperazine (20 g) were added, while stirring, 4-amino-2-chloro-6,7-dimethoxyquinazoline (22.2 g). The reaction mixture was heated to reflux and the reflux was maintained for about 13 hours. Then the reaction mixture was cooled to room temperature and stirred at this temperature for about 12 hours. The crystals were collected by filtration, washed with iso-butanol and dried in vacuo at 40° C. to yield 39.2 g (91.9%) of Terazosin.HCl dihydrate. See Trial A in Table I.

Provenance & Evidence