Process for preparing diltiazem using a heterogeneous trifunctional catalyst
申请人:COUNCIL OF SCIENTIFIC AND INDUSTRIAL RESEARCH
公开号:US20040127704A1
公开(公告)日:2004-07-01
The present invention comprises a simplified synthesis of (+)-diltiazem through IE-PdOsW wherein IE is ion-exchanger, catalyzed three-component coupling reaction and Fe
3+
-exchanged clay catalyzed ring opening of sulfite with 2-aminothiophenol followed by cyclization as key steps.
(EN) (+)-Cis-3-(acetoxy)-5-[2-(dimethylamino)-ethyl]-2,3-dihydro-2-(4-methoxyphenyl)-1,5-benzothiazepin-4(5H)-one hydrochloride is prepared by N-alkylation of (+)-cis-3-hydroxy-2,3-dihydro-2-(4-methoxyphenyl)-1,5-benzothiazepin-4(5H)-one with dimethylaminoethyl chloride and K2CO3 in toluene/water, addition of a solubilizing agent and in the presence of a phase-transfer catalyst, the toluene phase being directly subjected to the final O- acetylation.(FR) On prépare l'hydrochlorure de (+)-Cis-3-(acétoxy)-5-[2-(diméthylamino)-éthyl]-2,3-dihydro-2-(4-méthoxyphényl)-1,5-benzothiazepin-4(5H)-one par la N-alkylation du (+)-cis-3-hydroxy-2,3-dihydro-2-(4-méthoxyphényl)-1,5-benzothiazepin-4(5H)-one avec le chlorure de diméthylaminoéthyle et le K2CO3 dans le toluène et l'eau, et par l'addition d'un agent de solubilisation en présence d'un catalyseur à transfert de phase, la phase toluène étant directement soumise à la O-acétylation finale.
Process for preparing ethylcellulose microcapsules
申请人:Tanabe Seiyaku Co., Ltd.
公开号:EP0038979A1
公开(公告)日:1981-11-04
A process for preparing ethylcellulose microcapsules by flocculation of the ethylcellulose is disclosed. In this process, the flocculation of the ethylcellulose is carried out in the presence of an organosilicon polymer or in the presence of said organosilicon polymer and a surfactant.
Novel method of preparing benzothiazepine derivatives
申请人:Tanabe Seiyaku Co., Ltd.
公开号:EP0081234A1
公开(公告)日:1983-06-15
A benzothiazepine derivative of the formula:
wherein R is hydrogen or acetyl, is prepared by condensing a compound of the formula:
wherein R is the same as defined above, with 2-(dimethylamino)-ethyl halide (i) in the presence of potassium hydroxide in acetone; or (ii) in the presence of potassium carbonate in acetone, lower alkyl acetate, a mixture of acetone and water or a mixture of lower alkyl acetate and water.
式中:其中 R 为氢或乙酰基的苯并硫氮杂卓衍生物,是由式中:其中 R 与上文所定义的相同的化合物与 2-(二甲基氨基)-乙基卤化物(i)在丙酮中的氢氧化钾存在下;或(ii)在丙酮、低级烷基乙酸酯、丙酮和水的混合物或低级烷基乙酸酯和水的混合物中的碳酸钾存在下缩合制备的。
Process for preparing free-flowing ethylcellulose microcapsules
申请人:Tanabe Seiyaku Co., Ltd.
公开号:EP0099109A1
公开(公告)日:1984-01-25
A process for preparing free-flowing microcapsules by taking advantage of the phase-separation of ethylcellulos in cyclohexane is disclosed. In this process, a hydrocarbon compound which is soluble in cyclohexane and have a molecular weight of 150 to 3,000 and a solubility parameter (δ. at 25°C) of 7 to 10 (cal/cm3)½ is used as the phase-separation-inducing agent.