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All total 11 Articles be foundDifferent approaches in Partial Least Squares and Artificial Neural Network models applied for the analysis of a ternary mixture of Amlodipine, Valsartan and Hydrochlorothiazide
Darwish, Hany W.,Hassan, Said A.,Salem, Maissa Y.,El-Zeany, Badr A.
, p. 744 - 750 (2014)
Different chemometric models were applied for the quantitative analysis of Amlodipine (AML), Valsartan (VAL) and Hydrochlorothiazide (HCT) in ternary mixture, namely, Partial Least Squares (PLS) as traditional chemometric model and Artificial Neural Networks (ANN) as advanced model. PLS and ANN were applied with and without variable selection procedure (Genetic Algorithm GA) and data compression procedure (Principal Component Analysis PCA). The chemometric methods applied are PLS-1, GA-PLS, ANN, GA-ANN and PCA-ANN. The methods were used for the quantitative analysis of the drugs in raw materials and pharmaceutical dosage form via handling the UV spectral data. A 3-factor 5-level experimental design was established resulting in 25 mixtures containing different ratios of the drugs. Fifteen mixtures were used as a calibration set and the other ten mixtures were used as validation set to validate the prediction ability of the suggested methods. The validity of the proposed methods was assessed using the standard addition technique.
Metal-free oxidative cyclization of 2-amino-benzamides, 2-aminobenzenesulfonamide or 2-(aminomethyl)anilines with primary alcohols for the synthesis of quinazolinones and their analogues
Sun, Jinwei,Tao, Tao,Xu, Dan,Cao, Hui,Kong, Qinggang,Wang, Xinyu,Liu, Yun,Zhao, Jianglin,Wang, Yi,Pan, Yi
, p. 2099 - 2102 (2018/05/04)
A general metal-free oxidative cyclization process has been developed for the synthesis of quinazolinones, benzothiadiazines and quinazolines. By this protocol, a range of substituted 2-aminobenzamides, 2-aminobenzenesulfonamide and 2-(aminomethyl)anilines react with various alcohols, leading to the desired annulated products smoothly. This protocol features many advantages as broad substrate scope, mild reaction conditions, low environmental pollution, high atom-economy and good to excellent yields.
A method for production of hydrogen chlorothiazide
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Paragraph 0027-0030, (2017/03/08)
The invention belongs to the technical field of medicine production, and particularly relates to a production method for hydrochlorothiazide. Hydrochlorothiazide is prepared by using 4-amino-6-chloro-1,3-benzenedisulfonamide and formaldehyde as raw materials, reacting for 0.5-1.5 hours at a temperature of 90-100 DEG C; cooling a reaction liquid, de-coloring and adjusting a pH value to 5.5-7.0, and carrying out separation and purification. The production method is simple in process and suitable for industrialized production. The whole process is carried out in an aqueous phase; reaction conditions are mild; security coefficient is greatly increased; production period is short and is largely controlled at about 50 hours; the whole production process has small pollution to the environment; and the purity of the synthetic hydrochlorothiazide is high.
