N-heteroaryl-N'-phenylurea derivatives, their production and use
申请人:Nihon Nohyaku Co., Ltd.
公开号:US05464863A1
公开(公告)日:1995-11-07
An N-heteroaryl-N'-phenylurea derivative represented by the general formula (I): ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6 and R.sup.7 are as defined in the description of the specification which is useful as a prophylactic and therapeutic agent for hypercholesterolemia, atherosclerosis and diseases caused by them.
N-Heteroaryl-N'-phenylurea derivatives, their production and use
申请人:NIHON NOHYAKU CO., LTD.
公开号:EP0613894A1
公开(公告)日:1994-09-07
An N-heteroaryl-N'-phenylurea derivative represented by the general formula (I):
wherein R¹, R², R³, R⁴, R⁵, R⁶ and R⁷ are as defined in the description of the specification which is useful as a prophylactic and therapeutic agent for hypercholesterolemia, atherosclerosis and diseases caused by them.
Enantioselective and Step-Economic Synthesis of the Chiral Amine Fragment in the Tyrosine Kinase Inhibitor Repotrectinib by Direct Asymmetric Reductive Amination under Batch and Flow
A one-step and highly enantioselective synthesis of (R)-2-(1-aminoethyl)-4-fluorophenol ((R)-I), a key chiral intermediate toward preparation of the tyrosine kinase inhibitor repotrectinib, has been developed. Starting from the easily available substrate 1-(5-fluoro-2-hydroxyphenyl)ethan-1-one (2a), the target product (R)-I was prepared in an optically pure form through a Ru-catalyzed asymmetric reductive
( R )-2-(1-氨基乙基)-4-氟苯酚 (( R )-I )的一步高度对映选择性合成方法已开发出来,( R ) -I 是制备酪氨酸激酶抑制剂 repotrectinib 的关键手性中间体。从容易获得的底物 1-(5-氟-2-羟基苯基)乙烷-1-酮 ( 2a ) 开始,通过 Ru 催化的不对称还原胺化,以光学纯形式制备了目标产物 ( R ) -I以NH 4 OAc作为氮源,H 2作为还原剂。该反应可以使用连续流动反应器代替传统的间歇反应器以20克规模进行。流动技术能够实现更高的反应效率,并且不需要柱层析来纯化产物。与已知的方法相比,该方法避免了使用昂贵的手性助剂和保护基团操作,使其成为生产repotrectinib的步骤经济且具有成本效益的替代策略。