Archiv der Pharmazie p. 503 - 507 (1992)
Update date:2022-07-29
Topics:
Oelschlager
Martienssen
Belal
Cyprazepam (1) is reduced in 3 steps with consumption of 6 Θ at the DME as well as at the stirred Hg-cathode. During these processes ring contraction is observed with formation of 6-chloro-2-methyl-4-phenyl-3,4-dihydroquinazoline accompanied by elimination of cyclopropylmethylamine. This is the fifth example of a reductive ring contraction, which occurs only at a Hg-cathode but not during catalytic hydrogenation.
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(2020)