- Preparation method of anagrelide impurities B
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The invention discloses a preparation method of anagrelide impurities B. The structure of the anagrelide impurities B is shown in formula I as shown in specification, and is obtained by nitratlon reaction, reduction reaction, halogenating reaction, conden
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Paragraph 0057; 0058; 0059
(2018/05/01)
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- Novel pyridobenzoxazine derivative
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Pyridobenzoxazine derivatives having a [3,2,1--ij][3,1]benzoxazine structure represented by the formula (I) and their salts are disclosed. There are many varieties for the compound depending on the types of residues R1-R4, X1, and X2. The compounds of formula (I) and their salts have excellent antimicrobial activities and wide antimicrobial spectra, and are effective against both gram positive and gram negative microorganisms. They can be used as a medicine, an agrichemical, and a food preservative.
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- Alkyl 5,6-dichloro-3,4-dihydro-2(1H)-iminoquinazoline-3-acetate hydrohalides
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The known blood platelet antiaggregative agent 6,7-dichloro-1,5-dihydroimidazo[2,1-b]quinazolin-2(3H)-one is prepared in high yield via an improved process involving a novel intermediate of the Formula STR1 in which R1 is (lower)alkyl and X is bromo, chloro or iodo. Two processes for the preparation of compounds of the Formula III are disclosed, one of which involves the novel intermediate STR2
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