PROCESS FOR PRODUCING TETRAHYDROISOQUINOLINE-3-CARBOXYLIC ACID DERIVATIVE
申请人:KYOWA HAKKO KOGYO CO., LTD.
公开号:EP0636612A1
公开(公告)日:1995-02-01
A process for producing a 1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid derivative, represented by general formula (II), or a salt thereof (wherein R¹, R² and R³ may be the same or different from each other and each represents hydrogen, hydroxy or lower alkoxy; and R⁴ represents hydrogen, lower alkyl, aryl or aralkyl) by the reaction of a phenylalanine derivative represented by general formula (I) with formaldehyde or paraformaldehyde in the presence of sulfuric or hydrobromic acid, wherein R¹, R², R³ and R⁴ are each as defined above.
Process for the preparation of optically pure 1,2,3,4-Tetrahydro-3-isoquinoline-carboxylic acid and its derivatives
申请人:YUKONG LIMITED
公开号:EP0782990A1
公开(公告)日:1997-07-09
This invention relates to the preparation of optically pure tetrahydro-3-isoquinolinecarboxylic acid derivative of formula (III) which comprises the reaction of optically pure phenylalanine derivative of formula (I) with a formaldehyde precursor, such as formaline, trioxane, dialkoxymethane, or paraformaldehyde, for about 10 hours to 60 hours at about 40 °C to about 60 °C in concentrated hydrochloric acid to give the compound of formula (II), followed by neutralization in hot water at about 70 °C to about 100 °C with a base, such as ammonium hydroxide, potassium carbonate, sodium carbonate, sodium hydroxide or potassium hydroxide, according to the following reaction scheme.
本发明涉及光学纯的式(III)四氢-3-异喹啉羧酸衍生物的制备,包括光学纯的式(I)苯丙氨酸衍生物与甲醛前体,如福尔马林、三氧甲烷、二甲氧甲烷或多聚甲醛反应、在约 40 °C 至约 60 °C 的浓盐酸中反应约 10 小时至 60 小时,得到式 (II) 化合物,然后在约 70 °C 至约 100 °C 的热水中用碱,如氢氧化铵、碳酸钾、碳酸钠、氢氧化钠或氢氧化钾,按以下反应方案中和。
US5627282A
申请人:——
公开号:US5627282A
公开(公告)日:1997-05-06
[EN] AN IMPROVED METHOD FOR PREPARATION OF SUBSTITUTED TETRAHYDROISOQUINOLINES<br/>[FR] PROCEDE AMELIORE DE PREPARATION DE TETRAHYDROISOQUINOLEINES SUBSTITUEES
申请人:——
公开号:WO1997017050A2
公开(公告)日:1997-05-15
[EN] An improved method for the preparation and isolation of optically pure (3S) or (3R)-1, 2, 3, 4-tetrahydroisoquinoline-3-carboxylic acid comprises reacting formaldehyde with either D- or L-phenylalanine and hydrobromic acid to prepare the pure hydrobromide salts. The mixture is then cooled to precipitate the optically pure isomer which is filtered and then neutralized with a base to form the free acid and dried. [FR] Procédé amélioré de préparation et d'isolement d'acide (3S) ou (3R)-1, 2, 3, 4-tétrahydroisoquinoléine-3-carboxylique optiquement pur. Ce procédé consiste à faire réagir du formaldéhyde avec de la phénylalanine D ou L et de l'acide hydrobromique pour obtenir des sels d'hydrobromure pur. Le mélange est ensuite refroidi pour obtenir par précipitation l'isomère optiquement pur qui est filtré puis neutralisé à l'aide d'une base pour former l'acide libre avant d'être séché.