Trimethylsilyl cyanide was found to react with Schiff bases and oximes in the presence of a catalytic amount of Lewis acids to afford N-trimethylsilyl-α-aminonitriles and N-trimethylsilyloxy-α-aminonitriles in excellent yields, which were easily hydrolyzed to the corresponding α-aminonitriles and α-hydroxyaminonitriles.
Synthese und Reaktionen von 1-(1-Cyanoalkyl)-1-hydroxyharnstoffen
作者:Uwe Krüger、Gerwalt Zinner
DOI:10.1002/ardp.19783110109
日期:——
Die Hydroxyharnstoffe 5 cyclisieren entweder zu Imidazolidinen 8 oder bei gleichzeitiger Carbamoylierung des Hydroxylsauerstoffs zu Oxazolidin‐Derivaten 1, deren Äthanolyse die Oxazolidine 2 liefert. Aus den Hydroxylaminen 3 entstehen mit Phenylsenföl die Imidazolidine 12.
Twenty-two nitroso compounds with cyano, acyloxy, or carbonyl groups in geminal position were prepared, eight of them for the first time. In the solid state these compounds dimerize to colorless azodioxides. Exceptions are the 4-nitrobenzoyloxynitroso compounds 7b, f, and g which form bright blue crystals. In vitro (Born test, collagen) considerable antiplatelet activity was observed in each class of compounds. Azodioxides with cyano groups in geminal position (3a, b) were most active (IC50 approximate to 10 mu M) suggesting the importance of strong electron withdrawing groups in geminal position to the azodioxide partial structure. When administered orally to rats (60 mg/kg) all compounds inhibited the thrombus formation in mesenteric arterioles and venules. The acetyloxy derivatives 5d and 5e were most active (18-21% inhibition in arterioles and 11-15% inhibition in venules). In aqueous media at 37 degrees C the cyanonitroso compound 3b and the benzoyloxynitroso compound 7a decomposed to nitric oxide and its reduced form nitrosohydrogen. This suggests that the above pharmacological effects are mediated by a NO dependent mechanism.