Abstract
Ethyl 2-cyano-3-cyclohexyl-3-methyl-4-phenylbutanoate was synthesized from ethyl (2Z)-2-cyano-3cyclohexylbut-2-enoate using a Grignard reagent. It was shown that the reaction occurred exclusively at the ethylene bond. Because this cyanoester contained two asymmetric centers, PMR spectra showed two diastereoisomeric forms. These were cyclized in the presence of conc. H2SO4 into ethyl 4-amino-2-cyclohexyl-2-methyl-1,2-dihydronaphthalenecarboxylate, which was used to synthesize benzo[h]quinazolines, alkyl-substituted benzo[h]quinazolines, triazole, and tetrazole.
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