blocks in organic synthesis. We demonstrate a straightforward enzymatic cascade to synthesize enantiomerically pure propargylic alcohols and amines from readily available racemic starting materials. In the first step, the peroxygenase from Agrocybe aegerita converted the racemic propargylic alcohols into the corresponding ketones, which then were converted into the enantiomerically pure alcohols using
炔丙醇和胺是有机合成中的通用组成部分。我们展示了一种简单的酶级联反应,可以从容易获得的外消旋起始材料合成对映异构纯的炔丙醇和胺。在第一步中,来自Agrocybe aegerita的过氧化酶将外消旋炔丙醇转化为相应的酮,然后使用来自开菲尔乳杆菌的 ( R )-选择性醇脱氢酶或 ( S )-选择性醇脱氢酶将其转化为对映体纯醇来自布罗基热厌氧菌. 此外,使用来自土曲霉的( R )-选择性胺转氨酶或来自紫色色杆菌的( S )-选择性胺转氨酶,建立了将外消旋醇酶促Mitsunobu型转化为对映体富集的炔丙基胺。一锅两步级联反应以 70-99% 的产率产生了范围广泛的对映体富集的醇和胺产物。
Radical Nitrososulfonation of Propargyl Alcohols: Thiazolidine-2,4-dione-Assisted Synthesis of 5-Alykyl-4-sulfonylisoxazoles
In this study, we discover a good NO/HNO precursor, N-hydroxypyridinesulfonamide, and the regioselective radical nitrososulfonylation reaction of propargyl alcohols. Direct and unique isoxazole synthesis afforded a good-to-high yield of 5-alkyl-3-aryl-4-pyridinesulfonylisoxazoles. Copper-catalyzed aerobic oxidation could efficiently proceed in the presence of thiazolidine-2,4-dione. This work provides
[EN] PYRAZOLOPYRIDINE AS ADENOSINE ANTAGONISTS<br/>[FR] COMPOSES DE PYRAZOLOPYRIDINE UTILES EN TANT QU'ANTAGONISTES D'ADENOSINE
申请人:FUJISAWA PHARMACEUTICAL CO
公开号:WO2000024742A1
公开(公告)日:2000-05-04
A pyrazolopyridine compound of formula (I),: wherein R1 is a phenyl having one or two substituent(s) selected from the group consisting of halogen, lower alkyl, halo(lower)alkyl, hydroxy, lower alkoxy and ar(lower)alkoxy; and R2 is a hydrogen or a lower alkyl, or a salt thereof. The pyrazolopyridine compound (I) and a salt thereof of the present invention are adenosine antagonists and are useful for the prevention and/or treatment of depression, dementia (e.g. Alzheimer's disease, cerebrovascular dementia, dementia accompanying Parkinson's disease, etc.), Parkinson's disease, anxiety, pain, cerebrovascular disease (e.g. stroke, etc.), heart failure, and the like.