- Synthesis method 5 - halogeno-veratraldehyde
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The invention belongs to the field of organic chemistry, and in particular relates 5 - to a method for synthesizing halogenated O-veratraldehyde by using 4 - halogenoylguaiacol as a raw material to obtain 2 -hydroxy -3 - methoxy -5 -halogenated mandelic a
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- A synthetic preparation method for small carbags hydrochloric acid
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The present invention belongs to the field of organic chemistry, relates to a method of synthesizing berberine hydrochloride, comprising: S1: with 5-halo-o-quinoastearaldehyde and piperine ethylamine to obtain N- [2-(3,4-dimethoxyphenyl-5-yl) ethyl] -1- (5-halo-2,3-dimethoxybenzyl) methylimide; S2: to obtain 2- (3,4-diimoxyphenyl) -N- (5-bromo-2,3-dimethoxybenzyl) ethylamine; S3: to obtain 2-(3,4-dimethoxyphenyl) -N- (5-bromo-2 S4: to obtain 12-halogenated berberine derivative; S5: to obtain berberine. The present invention is free from the application of the by-product o-vanillin synthesis of o-resveratal raw material constraints, synthesis of 5- substitute o-resveratal and piperine ethylamine, and the use of the two preparation of berberine hydrochloride, with raw materials readily available, mild reaction conditions, easy to operate, high chemical yield, low cost and other advantages.
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- SUBSTITUTED ARYLAMINE COMPOUNDS AND THEIR USE AS 5-HT6 MODULATORS
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The invention relates to 5-HT6 receptor antagonists. Novel arylamine compounds having the formula: (see formula I) and pharmaceutically acceptable salts and/or esters thereof, wherein - n is 0, 1, 2, 3, or 4; - A, when present is a lower alkyl
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Page/Page column 134-135
(2008/06/13)
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- SYNTHESIS OF 5-HALOGEN-SUBSTITUTED 2,3-DIHYDROXYPHENYLACETIC ACIDS, THEIR ESTERS, AND 2,3-DIMETHOXYPHENYLACETOHYDROXAMIC ACIDS
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Many-stage general methods were developed for the synthesis of 5-bromo- or 5-chloro-substituted 2,3-dimethoxyphenylacetic acids from o-vanilin.Methods were also developed for their conversion into the corresponding hydroxamic acids, 2,3-dihydroxyphenylace
- Daukshas, V. K.,Martinkus, R. S.,Kuleshyus, V. A.,Shtel'bene, V. P.
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p. 458 - 463
(2007/10/02)
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