Abstract:
PURPOSE: A preparation method of methylene diphosphonic acid by using diidomethane having a higher boiling point than reaction temperature is provided which produces the title compound in high yield, improves high productivity and is very economic by reusing trialkylphosphate as a starting material. CONSTITUTION: A process is disclosed for preparing methylene diphosphonic acid(1) which comprises: (a)preparing tetralkylmethylenediphosphonic acid ester(4) by reacting trialkyl phosphate(2) with diiodomethane(3); (b)separating the compound(4) from the reactant by removing alkyl iodine; (c)recovering excess trialkylphosphate by distillation at 180°C and recycling to the process(a); (d)removing alkyl groups by thermal-cracking the ester at 200-210°C and recrystallizing. In formula, R is allyl, isopropyl, t-butyl, isobutyl. The compound is useful as raw material of radioactive pharmaceuticals for diagnosis.
Abstract:
본 발명은 1단계 또는 2단계 반응에 의한 의학 진단용 시약인 (RR/SS)-4, 8-디아자-3, 6, 6, 9-테트라 메틸 운데칸-3, 8-디엔-2, 10-디온 비스 옥심의 제조방법에 관한 것이다. 본 발명에 의해 d, l-HM-PAO가 효과적으로 얻어질 수 있다.
Abstract:
Triiodide benzene derivative of general formula(I) is prepared by (1) reacting aniline derivative of general formula(II) with acetyl compound under organic based on the obtained aniline derivative of the general formula(III) preserved by a hydroxyl group, (2) reacting with M-hydroxy carboxylate of general formula(IV) preserved by acetyl group in organic solvent and adding guanidine of the same catalyst amount to acylating compound obtained from a general formula(V). In the formula, R1 and R2 is independently hydrogen, methyl and low-level alkyl group respectively.
Abstract:
본 발명은 소위 세파클로르도 불리우는 7-(D-아미노-2-페닐아세트아미도)-3-클로로-3-세펨-4-카르복실산의 제조에 유용한 중간체들을 제조하기 위한 신규 고 개략된 방법을 제공한다. 본 발명의 방법은 디페닐메틸 7-페닐아세트아미도-3-히드록시-3-세펨-4-카르복실레이트 화합물(XI)이나 이의 톨루엔 1:1 용매화합물을 디메틸포름아미드내에서 0.5-2당량의 삼염화인, 1-3당량의 포스포 릴클로라이드, 1.5-3.5당량의 포스겐 및 1.5-3.5 당량의 옥살릴클로라이드에서 선택된 염소화제와 반응시켜 디패닐메틸 7-페닐아세트아미도-3-클로로-3-세펨-4-카르복실레이트 화합물(Ⅱ)을 제조 하는 제1공정; 제1공정에서 얻은 디페닐메틸 7-페닐아세트아미도-3-클로로-3-세펨-4-카르복실 레이트 화합물(Ⅱ)을 디플로로메탄, 1, 2-디클로로에탄 및 데트라히드로푸란에서 선택된 비활성 유기 용매내에서 1.6-3당랑의 오염화인 및 2-3당량의 피리딘과 반옹시킨 뒤 여기에 C l -C 12 의 지방족 알코올을 가하여 반응시켜 디페닐메틸 7-아미노-3-클로로-3-세펨-4-카르복실레이트 화합물(Ⅲ)을 제조하는 제2공정; 및 제2공정에서 얻은 디페닐메틸 7-아미노-3-클로로-3-세펨-4-카르복실레이트 화합물(Ⅳ)을 개미산 혹은 페놀과 반응시켜 7-아미노-3-클로로-3-세펨-4-카르복실레이트 화합물(Ⅳ)을 제조하는 제3공정으로 이루어지는 것을 특징으로 한다.
Abstract:
The method for preparing proline compounds of formula (I), used as the inhibitor against angiotensin and antihypertensive agent, is presented. Thus, 4.1g of N-(2-bromopropionyl)-proline benzylester is dissolved in 200 ml of chloroform and the above mixture is cooled in water-ice bath. Then, 1.7g of 2-bromopropionyl chloride is dropped slowly to the 15ml of chloroform solution containing the proline ester. The above mixture is stirred at 25≦̸C for 24 hrs and the obtained chloroform layer is washed with water three times, evaporated and purified using chromatograhy. In (I), R1 and R7 are each H, C1-10 lower alkyl or aryl; R2, R3, R5 and R6 are each H, C1-10 lower alkyl, aryl, amine or cyano ; R4 is H or C1-10 lower alkyl.