Patent ID: 8299304

Claim:
A method for the preparation of the diamine compound represented by formula 1: wherein R 1 is an alkyl group having 5 to 7 carbon atoms or alkoxy group having 5 to 7 carbon atoms, comprising: a) preparing a compound of formula 2 by reacting 4′-alkylbicyclohexyl-4-one compound with 1,3,5-tribromobenzene: wherein R 1 is an alkyl group having 5 to 7 carbon atoms or alkoxy group having 5 to 7 carbon atoms; b) preparing a compound of formula 3 by reacting the compound of formula 2 with p-toluenesulfonic acid 1-hydrate: wherein R 1 is an alkyl group having 5 to 7 carbon atoms or alkoxy group having 5 to 7 carbon atoms; c) preparing a compound of formula 4 by reacting the compound of formula 3 with lithium bis(trimethylsilyl)amide, (dibenzylideneacetone)palladium, and tricyclohexylphosphine in combination: wherein R 1 is an alkyl group having 5 to 7 carbon atoms or alkoxy group having 5 to 7 carbon atoms; and d) performing the addition of hydrogen to the compound of formula 4 under a Pd/C catalyst and separating a trans isomer compound therefrom.