35092-89-8Relevant articles and documents
Method for preparing 2-amino-4-aminomethyl methyl benzoate and hydrochloride thereof
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Paragraph 0051-0053; 0060-0062; 0069-0072, (2020/09/08)
The invention relates to the field of organic synthesis, and discloses a method for preparing 2-amino-4-aminomethyl methyl benzoate and hydrochloride thereof. The method comprises the following steps:1) sequentially contacting dimethyl terephthalate with a nitration reagent and acetic acid to obtain 3-nitro-4-methoxycarbonyl benzoic acid; (2) converting the 3-nitro-4-methoxycarbonyl benzoic acidinto 2-nitro-4-methoxycarbonyl benzoyl chloride, and enabling the 2-nitro-4-methoxycarbonyl benzoyl chloride to be in contact with ammonia gas so as to obtain methyl 2-nitro-4-formylaminobenzoate; 3)performing dehydration reaction on the 2-nitro-4-formylaminobenzoic acid methyl ester to obtain 2-nitro-4-cyanobenzoic acid methyl ester, and 4) performing reduction reaction on the 2-nitro-4-cyanobenzoic acid methyl ester to obtain 2-amino-4-aminomethyl benzoate. The preparation method has the advantages of high yield, high purity and environmental protection.
PROCESS FOR PREPARATION OF 1-NITROBENZENE-2-ALKYLOXYCARBONYL-5-CARBOXYLIC ACID
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Page/Page column 7, (2019/08/29)
The present invention relates to processes for preparation of 1 -nitrobenzene-2- alkyloxycarbonyl-5-carboxylic acid. In particular, the present invention relates to preparation of 1 -nitrobenzene-2-alkyloxycarbonyl-5-carboxylic acid by partial hydrolysis of diester of 1 -nitrobenzene 2,5-dicarboxylic acid in presence of hydrogen chloride.
Synthesis of a new fluorine-18-labeled bexarotene analogue for PET imaging of retinoid X receptor
Wang, Min,Davis, Toni,Gao, Mingzhang,Zheng, Qi-Huang
, p. 1742 - 1747 (2014/04/17)
The reference standard 2-fluoro-4-(1-(3,5,5,8,8-pentamethyl-5,6,7,8- tetrahydronaphthalen-2-yl)vinyl)benzoic acid was synthesized from 2,5-dimethyl-2,5-hexanediol and 2-fluoro-4-methylbenzoic acid in 10 steps with 3% overall chemical yield. The precursor 2-nitro-4-(1-(3,5,5,8,8-pentamethyl-5, 6,7,8-tetrahydronaphthalen-2-yl)vinyl)benzoic acid was synthesized from 2,5-dimethyl-2,5-hexanediol and dimethyl-2-nitroterephthalate in seven steps with 2% overall chemical yield. The target tracer 2-[18F]fluoro-4-(1- (3,5,5,8,8-pentamethyl-5,6,7,8-tetrahydronaphthalen-2-yl)vinyl)benzoic acid was synthesized from its nitro-precursor by the nucleophilic substitution with K[18F]F/Kryptofix 2.2.2 and isolated by HPLC combined with solid-phase extraction (SPE) purification in 20-30% radiochemical yield with 37-370 GBq/μmol specific activity at end of bombardment (EOB).