Synthesis of 1,2,3,4‐tetrahydroquinazoline derivatives as potential alpha‐adrenergic blocking agents

The synthesis of N,N′‐bis[6‐(1,2,3,4‐tetrahydro‐3‐quinazolidyl)hexyl]cystamine (I) and 3‐(6‐aminohexyl)‐1,2,3,4‐tetrahydroquinazoline (II) are described. Compound I is obtained by condensation of o‐nitrobenzoyl chloride with 3‐(6‐aminohexyl)‐1,3‐thiazolidine (III) followed by dimerization, reduction and formation of tetrahydroquinazoline ring. A similar method was used for preparation of compound II. These compounds and some synthesis intermediates are potential alpha‐adrenergic blockers.