An alternative way of synthesis of amitriptyline is by interaction of 10,11-dihydro-N,N-dimethyl-5H-dibenzo[a,d]-cyclohepten-5-one with cyclopropylmagnesium bromide, giving 10,11-dihydro-N,N-dimethyl-5H-dibenzo[a,d]-cyclohepten-5-cyclopropyl-5-ol (7.1.5). Reacting this with hydrogen bromide in acetic acid results in an opening of the cyclopropyl ring, which forms 5-(3-bromopropyliden)-10,11-dihydro-5H-dibenzo[a,d]-cycloheptene (7.1.6). Alkylating this with dimethylamine gives amitriptyline (7.1.4) [12,13].

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