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公开(公告)号：US20220089526A1
公开(公告)日：2022-03-24
申请号：US17420009
申请日：2019-01-02
发明人： Guoliang Tu , Jiansheng Huang , Lu Zhang , Tao Yang , Zunjun Liang
IPC分类号： C07C269/06 , B01J31/02
摘要： A synthesis method for a candesartan cilexetil intermediate represented by formula (II) is provided. The method includes (1) dissolving a compound represented by formula (IV) to an aprotic solvent to obtain a first mixed solution, and dissolving a phase transfer catalyst and an azidation reagent to water to obtain a second mixed solution; (2) dropping the first mixed solution to the second mixed solution for azidation reaction, and after the reaction is ended, standing and layering same to obtain an organic phase containing a compound represented by formula (V); (3) dropping the obtained organic phase containing the compound represented by formula (V) to tertiary butyl alcohol for rearrangement reaction, and after the reaction is ended, concentrating same to obtain a solid or oily material, then adding a crystallizing solvent to the obtained solid or oily material for recrystallization, and separating same to obtain a crystal.
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公开(公告)号：US20220234970A1
公开(公告)日：2022-07-28
申请号：US17616454
申请日：2020-01-06
发明人： Lu Zhang , Guoliang Tu , Jianyue Xu , Heping Jin , Su Wang , Qi Hu , Sen Yang , Heng Liu
IPC分类号： C07C17/16
摘要： Disclosed is a preparation method for triphenylchloromethane, comprising the following steps: adding hydrochloric acid or a mixture of hydrochloric acid and Lewis acid to a mixture of triphenylmethanol and an organic solvent; stirring for reaction; removing the water layer after the completion of reaction to obtain an organic solution containing triphenylchloromethane. In the method, the conversion rate of triphenylmethanol is almost quantitative to be above 99%, and the content of triphenylchloromethane in the product obtained is above 99%. The operation is simple, and no waste gas is generated. Therefore, the method is environmentally friendly and suitable for industrialized production and can achieve better economic benefits.
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公开(公告)号：US12091375B2
公开(公告)日：2024-09-17
申请号：US17616454
申请日：2020-01-06
发明人： Lu Zhang , Guoliang Tu , Jianyue Xu , Heping Jin , Su Wang , Qi Hu , Sen Yang , Heng Liu
IPC分类号： C07C17/16
摘要： Disclosed is a preparation method for triphenylchloromethane, comprising the following steps: adding hydrochloric acid or a mixture of hydrochloric acid and Lewis acid to a mixture of triphenylmethanol and an organic solvent; stirring for reaction; removing the water layer after the completion of reaction to obtain an organic solution containing triphenylchloromethane. In the method, the conversion rate of triphenylmethanol is almost quantitative to be above 99%, and the content of triphenylchloromethane in the product obtained is above 99%. The operation is simple, and no waste gas is generated. Therefore, the method is environmentally friendly and suitable for industrialized production and can achieve better economic benefits.
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公开(公告)号：US20190002440A1
公开(公告)日：2019-01-03
申请号：US16064003
申请日：2017-01-16
发明人： Hu Huang , Wenfeng Huang , Guoliang Tu , Jiegen Liu , Zhongming Xu , Qianghui Wu , Zhaoyang Meng , Yuling Fang
IPC分类号： C07D403/06
摘要： Provided is a synthesis method for a voriconazole intermediate condensate as shown in formula II or an acid addition salt thereof. As shown in reaction formula 1, the product is prepared via compounds III and IV. The synthesis method adjusts the feeding means, and the reaction conditions are mild and controllable, thereby reducing the production of impurity A, avoiding the use of highly toxic metal lead, and eliminating the risk of highly toxic metal remaining in a drug. The product has a higher purity and significant industrial application value.
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公开(公告)号：US11919884B2
公开(公告)日：2024-03-05
申请号：US16330692
申请日：2016-11-10
发明人： Hu Huang , Wenfeng Huang , Guoliang Tu , Zhongming Xu , Qianghui Wu , Zhaoyang Meng , Yuling Fang
IPC分类号： C07D403/06 , C07B57/00 , C07C303/22 , C07C309/19
CPC分类号： C07D403/06 , C07B2200/13
摘要： A method for preparing voriconazole L-camphorsulphonate and voriconazole. The method for preparing voriconazole L-camphorsulphonate comprises: method 1: dissolving (2R,3S)/(2S,3R) isomer mixture and L-camphor sulphonic acid in water and acetone, and performing crystallisation filtration to obtain voriconazole L-camphorsulphonate; method 2: (a) dissolving a mixture of isomer mixture and L-camphor sulphonic acid in a first solvent and then performing crystallisation filtration; or (a′) dissolving L-camphorsulphonate of the isomer mixture in a first solvent and then performing crystallisation filtration; (b) concentrating the filtrate obtained in step (a) or (a′) into a solid; and (c) dissolving the solid obtained in step (b) in a second solvent and performing crystallisation filtration to obtain voriconazole L-camphorsulphonate. Adjusting the resolution solvent effectively reduces production costs and facilitates recycling of the resolution solvent.
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公开(公告)号：US20210276980A1
公开(公告)日：2021-09-09
申请号：US16330692
申请日：2016-11-10
发明人： Hu Huang , Wenfeng Huang , Guoliang Tu , Zhongming Xu , Qianghui Wu , Zhaoyang Meng , Yuling Fang
IPC分类号： C07D403/06
摘要： A method for preparing voriconazole L-camphorsulphonate and voriconazole. The method for preparing voriconazole L-camphorsulphonate comprises: method 1: dissolving (2R,3S)/(2S,3R) isomer mixture and L-camphor sulphonic acid in water and acetone, and performing crystallisation filtration to obtain voriconazole L-camphorsulphonate; method 2: (a) dissolving a mixture of isomer mixture and L-camphor sulphonic acid in a first solvent and then performing crystallisation filtration; or (a′) dissolving L-camphorsulphonate of the isomer mixture in a first solvent and then performing crystallisation filtration; (b) concentrating the filtrate obtained in step (a) or (a′) into a solid; and (c) dissolving the solid obtained in step (b) in a second solvent and performing crystallisation filtration to obtain voriconazole L-camphorsulphonate. Adjusting the resolution solvent effectively reduces production costs and facilitates recycling of the resolution solvent.
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公开(公告)号：US10961194B2
公开(公告)日：2021-03-30
申请号：US16623085
申请日：2017-06-16
发明人： Guoliang Tu , Zhongming Xu , Tao Zhou , Wenfeng Huang , Shiwen Zhang
IPC分类号： C07D209/34
摘要： Provided is a method for purifying ropinirole hydrochloride (4-2-di-n-propylaminoethyl-1,3-dihydro-2H-indole-2-ketohydrochloride). The method comprises: adding ropinirole hydrochloride containing a monopropyl impurity A into water, adding organic solvent, stirring and dissolving at room temperature, adding alkali, stirring, standing, demixing, and removing an aqueous layer; optionally, drying the organic layer by using anhydrous magnesium sulfate, and filtering; and adding acyl chloride or acid anhydride into the organic layer, stirring, concentrating the organic layer to be dry, adding an organic solvent into the obtained oily matter, adding concentrated hydrochloric acid, and stirring, so as to obtain the ropinirole hydrochloride. By using the method, the impurity A in the ropinirole hydrochloride can be effectively removed, and the ropinirole hydrochloride can be obtained with a high yield and a high purity, so that the impurity A is controlled and the purity of the product reaches a medicinal standard.
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公开(公告)号：US10227293B2
公开(公告)日：2019-03-12
申请号：US15580517
申请日：2015-06-09
申请人： Zhejiang Huahai Pharmaceutical Co., Ltd , Zhejiang Huahai Licheng Pharmaceutical Co., Ltd , Zhejiang Huahai Jiancheng Pharmaceutical Co., Ltd
发明人： Zunjun Liang , Weifeng Xiao , Caihua Peng , Wenfeng Huang , Guoliang Tu
IPC分类号： C07C253/30 , C07C255/59 , C07B49/00 , C07F3/02
摘要： The present invention relates to a method for preparing a citalopram diol represented by formula IV, comprising the following steps: in the existence of an auxiliary reagent of metal salt, allowing 5-cyanophthalide to sequentially subjected to Grignard addition reactions with p-fluorophenyl magnesium halide and N, N-dimethylaminopropyl magnesium halide in an organic solvent; and after the reactions are completed, performing hydrolysis and separation to obtain citalopram diol represented by formula IV. In the present invention, by adding an auxiliary reagent of metal salt, the activity and the selectivity of the Grignard reactions are remarkably improved, and the reaction yield is obviously enhanced.
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公开(公告)号：US20180155326A1
公开(公告)日：2018-06-07
申请号：US15578541
申请日：2015-06-05
发明人： Enmin Lin , Mengjian Mou , Guoliang Tu , Wenfeng Huang
IPC分类号： C07D403/10 , C07D257/04 , C07D235/26 , C07F7/22 , C07B47/00
CPC分类号： C07D403/10 , C07B47/00 , C07D235/26 , C07D257/04 , C07F7/2284 , Y02P20/55
摘要： The present invention uses a candesartan cyclic compound as a starting material and performs thereon a three-step reaction of forming tetrazole, hydrolysis and adding a protecting group to directly obtain trityl candesartan without separating an intermediate product via crystallization. The operating process is simple and thus is more applicable to industrial production.
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