The reaction of bis-(3-hydroxypropyl)-ethylene diamine (1) with 1-Bromo-3-chloropropane (2) gives homopiperazine [19970-80-0]
(3). Esterification by reaction with 3,4,5-Trimethoxybenzoyl Chloride [4521-61-3] (4) completed the synthesis of Dilazep (5).
See also
Hexobendine, a drug with similar chemical structure
^GB1107470 idem Herbert Arnold, Kurt Pahls, Rolf Rebling,Norbert Brock, Hans-Dieter Lenke, U.S. patent 3,532,685 (1970 to Asta Werke Ag Chem Fab).
^Schlögl, K., Schlögl, R. (1964). "Über pharmakodynamisch wirksame 3,4,5-Trimethoxybenzoate und verwandte Ester von symmetrischen Bis-hydroxyalkylpiperazinen und-dialkylpolymethylendiaminen". Monatshefte für Chemie. 95 (3): 922–941. doi:10.1007/BF00908805.