Patent GB-1328696-A (GB)
Title: 1-azazyclopentano-1,2-a-adamantane compounds and derivatives thereof
IPC: C07C209/54
Filed: 1970-08-27
Abstract: 1328696 1 - Azacyclopentano[1,2-a]adamantanes E R SQUIBB & SONS Inc 27 Aug 1970 [2 Sept 1969 4 May 1970] 41338/70 Heading C2C Novel 1 - azacyclopentano[1,2-a]adamantanes of the general formula wherein R is a hydrogen atom or a C 1-6  alkyl or C 1-6  alkoxy group, R 0  is a hydrogen atom or a C 1-6  alkyl group and Y is a hydrogen atom, a C 1-6  alkyl or C 2-6  alkenyl group, an aralkyl group of up to 10 carbon atoms, a group of formula -(CH 2 ) n CO 2 H, in which n is 1-5 or a group of formula -(CH 2 ) m NR 1 R 2 , in which m is 2-5 and R 1  and R 2  are each a hydrogen atom or a C 1-6  alkyl or C 2-6  alkenyl group, or one of R 1  and R 2  is an optionally substituted adamantyl group, or NR 1 R 2  is an optionally substituted heterocyclic group of up to 12 carbon and heteroatoms, the heterocyclic ring of which has 5-7 members, optionally including a second heteroatom which is an oxygen, sulphur or nitrogen atom, are prepared (a) when Y is a C 1-6  alkyl group, by heating a 1-chloro-N-alkyl- 2-adamantane-ethylamine of the general formula wherein R 3  is a C 1-6  alkyl group; (b) when Y is a hydrogen atom, by dealkylating the product of (a); (c) when Y is a hydrogen atom, by reducing a lactam of the general formula (d) when Y is other than a hydrogen atom, by treating the product of (b) or (c) with a halide of the general formula Y-X, wherein X is a chlorine, bromine or iodine atom; and (e) when Y is a group of formula -(CH 2 ) n COOH, by hydrolysis of the corresponding compound wherein Y is a group of formula -(CH 2 ) n CN or -(CH 2 ) n CO 2 R 6 , wherein R 6  is a C 1-18  alkyl group. 1 - Chloro - N - alkyl - 2 - adamantane - ethylamines of the second general formula above are prepared by heating an R-substituted 1- hydroxyadamantane with cone. sulphuric acid, reacting the resulting 2-adamantanone of the general formula with an R 0 -substituted trialkyl phosphonoacetate in the presence of sodium hydride, heating the resulting alkyl #'<SP>2</SP>, α-adamantane-acetate of the general formula wherein s is 0, 1, 2 or 3, with alcoholic sodium or potassium hydroxide, catalytic reduction of the #<SP>2</SP>,α-adamantane-acetic acid of the general formula thus obtained, treatment of the 2-adamantaneacetic acid of the general formula so produced with thionyl or oxalyl chloride, reaction of the resulting 2-adamantane-acetyl chloride of the general formula with an amine of the general formula R 3 NH 2 , lithium aluminium hydride reduction of the resulting N - alkyl - 2 - adamantane - acetamide of the general formula chlorination of the resulting N-alkyl-2-adamantane-ethylamine of the general formula and photolysis of the resulting N-chloro-N- alkyl - 2 - adamantane - ethylamine of the general formula in a mixture of sulphuric and acetic acids. 2 - (2 - Adamantane) - propionic acid is prepared by treating 2-adamantane-acetic acid successively with thionyl chloride, diazomethane and silver oxide. 3-(2-Adamantane)- butyric acid is prepared analogously from 2-(2- adamantane)propionic acid. Pharmaceutical compositions having antiviral and anti-inflammatory activity comprise, as active ingredient, a 1-azacyclopentano[1,2-a]adamantane of the first general formula above or a physiologically acceptable salt thereof, together with a solid or liquid, non-basic, pharmaceutical carrier, and may be administered orally or parenterally.