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O. B. Kazakova N. I. Medvedeva O. S. Kukovinets G. A. Tolstikov E. F. Khusnutdinova L. Zaprutko B. Bednarczyk-Cwynar Z. Paryzek 《Chemistry of Natural Compounds》2010,46(3):397-399
A method for preparing methyl esters of 12-oxoolean-28-oic and 3,12-dioxoolean-28-oic acids via ozonolysis of oleanolic acid
methyl ester in CH2Cl2 at –60°C was proposed. It was found that oxidation of 2-cyano3,4-seco-4(23)-oleanenoic acid was chemoselective depending
on the amount of ozone used. 相似文献
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Lucjusz Zaprutko Dorota Olender Andrzej Gzella 《Monatshefte für Chemie / Chemical Monthly》2003,134(8):1145-1150
Summary. Reactions of 1-phenacyl derivatives of 2-methyl-4,5-dinitroimidazole with primary or secondary amines (aniline, morpholine, piperidine, pyrrolidine) yielded the 4-amino-5-nitroimidazole derivatives only.Received January 23, 2003; accepted (revised) February 5, 2003
Published online June 2, 2003 相似文献
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