Acetone Cyanohydrin → 3-nitro-5-oxo-6,7,8,9-tetrahydro [5H] benzocycloheptene-7-carbonitrile

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The novel process of the invention for the preparation of a compound of formula I wherein X is nitro comprises reacting 3-nitro-8,9-dihydro [5H] benzocycloheptene-5-one of the formula ##STR3## with acetone cyanhydrin of the formula to obtain 3-nitro-5-oxo-6,7,8,9-tetrahydro [5H] benzocycloheptene-7-carbonitrile of the formula ##STR4## reducing the latter with diborane in an organic solvent to obtain 3-nitro-7-aminomethyl-6,7,8,9-tetrahydro [5H] benzocycloheptene-5-ol of the formula ##STR5## deshydrating the latter to form 2-nitro-6,7-dihydro [5H] benzocycloheptene-7-methanamine of the formula ##STR6## and either reacting the latter with formic aldehyde and sodium cyanoborohydride to obtain N,N-dimethyl-2-nitro-6,7-dihydro [5H] benzocycloheptene 7-methanamine of the formula ##STR7## which may be reacted with an alkyl chloroformate of the formula

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