Facile synthesis of two benzamidine-steroid derivatives

Several steroid derivatives have been synthesized; however, expensive reagents and special conditions are required. Therefore, in this study two benzamidine-steroid derivative were synthetized using several strategies; the first step was achieved by the synthesis of N-(3-Butyl-1-cyclohexyl-4-cyclohexylimino-azetidin-2-ylidene)-4-nitro-benzamide (4) by the reaction of 4-nitrobenzoyl azide, 1-hexyne and N,N'-Dicyclohexylcarbodiimide using cuprous iodide as catalyst. The second involves the preparation of N-(3-Butyl-1-cyclohexyl-4-ciclohexylimino-azetidin-2-ylidene)-4-(naphta len-2-yloxy)-benzamide (5) by the reaction of 4 with P-naphtol in the presence of dimetyhylsulfoxide. The compound 5 was reacted with ethylenediamine to form N-(2-Amino-ethyl)-N'-(butyl-1-cyclohexyl-4-cyclohexylimino-azetidin-2-ylidene)-4-(naph talen-2-yloxy)-benzamide (6) in the presence of boric acid. The following stage was achieved by synthesis of N-(3-Butyl-1-cyclohexyl-4-cyclohexylimino-azetidin-2-ylidene)-N'-[2-(17-hydroxy-10,13-dimethyl-1,2,6,7,8,9,10,11,12,13,14, 15,16,17-tetradecahydro-cyclopenta[a] phenanthren-3-ylideneamino)-ethyl]1-4-(naphtalen-2-yloxy)-benzamidine (7) using boric acid as catalyst. Also 6 was reacted with estrone to form N-(3-Butyl-1-cyclohexyl-4-cyclohexylimino-azetidin-2-ylidene)-N'-[2-(3-hydroxy-13-methyl-6,7,8,9,11,12,13,14,15, 16-decahydro-cyclopenta[a]phenanthren-17-ylideneamino)-ethyl]-4-(naphtalen-2-yloxy)-benzamidine (8) in the presence of boric acid. The structure of all compounds obtained was confirmed by spectroscopic and spectrometric methods. In conclusion; the methods used offer some advantages such as simple procedure, low cost, and ease of work.