Synthesis and pharmacological evaluation of (nitrooxy)alkyl apovincaminate

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Abstract
A series of (nitrooxy)alkyl apovincaminates has been synthesized and evaluated for their effects on vertebral and femoral blood flow. These derivatives were prepared from apovincaminic acid (4). In cerebral circulation, compound 5 (0.03-1.0 mg/kg iv) caused a dose-dependent increase in cerebral blood flow (CerBF) without affecting the blood pressure. It was more potent than vinpocetine (2). The structures of 2 and 5, determined by X-ray crystallography, showed differences in the electrostatic potential image and in the conformation of the ethyl group at the 16-position.

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