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    • 5. 发明专利
    • PROCESS AND INTERMEDIATES FOR PRODUCTION OF CABERGOLINE AND RELATED COMPOUNDS
    • CA2412861A1
    • 2002-10-31
    • CA2412861
    • 2001-04-16
    • FINETECH LAB LTD
    • GUTMAN ARIE LNISNEVICH GENNADIYPERTSIKOV BORISTISHIN BORISRUKHMAN IGORVILENSKY ALEX
    • C07B61/00C07D457/06C07F7/10
    • A process for preparation of N-(ergoline-8.beta.-carbonyl)ureas of the formula [I] their stereoisomers as well as acid addition salts thereof which process comprises silylating an ergoline -8.beta.-carboxamide of the formula [2], their stereoisomers as well as metal or ammonium salts or acid addition salts thereof and reacting the resultant product with an isocyanates R1N=C=O [5] wherein R1 is selected from alkyl having from 1 to 4 carbon atoms, cyclohexyl, phenyl, and dimethylamino alkyl group -(CH2)nNMe2 in which n is an integer, R2 is selected from hydrogen, alkyl having from 1 to 4 carbon atoms , cyclohexyl, phenyl, dimethylamino alkyl group -(CH2)nNMe2 in which n is an integer, pyridyl, pyrimidyl, pyrazinyl, pyridazinyl, thiazolyl or thiadiazol yl , R3 represents a hydrocarbon group having from 1 to 4 carbon atoms, and R4 is selected from hydrogen, halogen, methylthio and phenylthio group; followed b y desilylation. This novel approach provides an efficient method for preparati on of N-(ergoline-8.beta.-carbonyl)ureas of the formula [I] which can be useful as anty-Parkinson drugs and prolactin inhibitors. One of the most potent antiprolactinic agent of the class of compounds prepared according to the present invention is Cabergoline. Silylated ergolines, which are obtaine d as intermediates in the process of the present invention, are novel compound s and represent a further aspect of the invention.