A novel protocol for the synthesis of indolone and quinolone derivatives from o-nitroaryl acids was developed using Zn and HCO2NH4 under supercritical fluid carbon dioxide (scCO2) medium. The process involves the reduction of the nitro group to an amino group followed by in situ cyclisation.
A new class of selective vasopressin receptor 1A (V1A) antagonists was identified, where “methyl-scan” was performed around the benzene ring of the 5-hydroxy-triazolobenzazepine core. This led to the synthesis of two 10-methyl derivatives, each possessing a chiral axis and a stereogenic center. The four atropisomeric stereoisomers (involving two enantiomer pairs and atropisomeric diastereomers) could
确定了一类新的选择性加压素受体 1A (V 1A ) 拮抗剂,其中“甲基扫描”是在 5-羟基-三唑并苯并氮杂核心的苯环周围进行的。这导致合成了两种 10-甲基衍生物,每种衍生物都具有手性轴和立体中心。可以成功地分离和光谱表征四种阻转异构体(包括两个对映异构体对和阻转异构体非对映异构体)。根据这些化合物的体外药理学特征,人 V 1A受体对具有R轴手性的异构体有强烈的偏好,最活跃的异构体是 a R ,5 S异构体。此外,异构体和新合成的类似物的构效关系可以通过计算机研究初步解释。
Synthesis of Oxindoles via SmI2-Promoted Reduction of 2-Nitrophenylacetic Acids
作者:Songlin Zhang、Pengkai Wang
DOI:10.1055/a-2175-1008
日期:2024.1
reduction of 2-nitrophenylacetic acids to oxindoles promoted by SmI2 is reported for the first time. This reaction involving the reduction of nitro group proceeds through N–O bond cleavage and direct condensation with the neighboring carboxyl group. From a synthetic point of view, a new method for the synthesis of oxindoles in mild neutral conditions is developed.