Chemical and Pharmaceutical Bulletin
Online ISSN : 1347-5223
Print ISSN : 0009-2363
Synthesis of N-Substituted (6-Benzyl-4, 4-dimethyl-2-cyclohexenyl)-methylamines and Related Compounds
TAKESHI KATOKIYOHISA KAWAIYOICHI SAWA
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Keywords: chlorination
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Volume 32 (1984) Issue 1 Pages 44-54

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Abstract

In a search for synthetic non-narcotic analgesics, 1, 6-trans-N-substituted (6-benzyl-4, 4-dimethyl-2-cyclohexenyl) methylamines (5) were prepared by dehydration of the corresponding 2, 3-trans-2-aminomethyl-3-benzylcyclohexanols (2 and 3) with thionyl chloride. The (1-cyclohexenyl) methylamines (4) and the 1, 2-trans-(2-chlorocyclohexyl) methylamines (6) were also produced from the 1, 2-cis-cyclohexanols (2) as minor products, but the only isolable by-product from the 1, 2-trans-cyclohexanols (3) was the 1, 2-cis-(2-chlorocyclohexyl) methylamines (7). The 1, 6-cis-(6-benzyl-2-cyclohexenyl) methylamine (13a) was obtained by isomerization of the 2, 3-trans-3-benzyl-2-dimethylaminomethylcyclohexanone (1a) followed by reduction and dehydration. Catalytic hydrogenation of (2-benzyl-2-cyclohexenyl) methylamines (17) gave the 1, 2-trans-and 1, 2-cis-cyclohexylmethylamines (8 and 19). Among the compounds tested, 1, 6-trans-N, N-dimethyl-(6-benzyl-4, 4-dimethyl-2-cyclohexenyl) methylamine (5a) hydrochloride was as potent as codeine phosphate in analgesic activity as determined by the phenylquinone writhing method.

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