由于α-立体中心的敏感性,具有最小外消旋化的手性氨基酸酯的N-芳基化是具有挑战性的转化。开发了一种通用的合成方法,以在连续流动条件下使用环己酮作为芳基来源制备N-芳基化氨基酸酯。设计的流动系统由盘管反应器和含有 Pd(OH) 2 /C 催化剂的填充床反应器组成,有效地提供了所需的N-芳基化氨基酸,而没有显着的外消旋化,仅伴随少量易于去除的共聚反应。 - 产品(即,H 2O 和烷烃)。该方法的效率和稳健性允许以非常高的产率和对映体纯度连续合成所需的产物,同时具有高时空产率(74.1 g L -1 h -1)和周转频率(5.9 h -1)至少持续3天。
DOI:
10.1002/chem.202101439
作为产物:
描述:
L-色氨酸 在
盐酸 作用下,
以
乙醇 为溶剂,
以17.4 g (92.5%)的产率得到L-色氨酸乙酯盐酸盐
Tryptophan-derived selective nanomolar butyrylcholinesterase inhibitors with great potential for symptomatic therapy against Alzheimer's disease are disclosed.
色氮氨酸衍生的选择性纳摩尔丁酰胆碱酯酶抑制剂揭示了对抗阿尔茨海默病症状治疗具有巨大潜力。
An efficient synthesis, characterization, DFT study and molecular docking of novel sulfonylcycloureas
spectroscopy. Moleculardocking are used to study the anticancer activity of the most active compounds. Moleculardocking of the molecule 3 into the AKR1C1 crystal structure reveals the key interactions with the active site. The theoretical calculations for the compounds 3a-3e were performed using DFT/B3LYP/6-31 G (d,p) method. The optimized structural parameters, Frontier molecular orbitals (FMO's)
N‐Propargyl‐ and N‐homoallenyl‐2‐bromo‐β‐tryptamines undergo gold(I)‐catalyzed dearomatizing cyclizations to afford 2‐bromospiroindolenines that are in situ hydrolyzed to furnish spirooxindoles in a one‐pot process. Tryptophane derivatives (R2=CO2Et) led upon cyclization to chiral spirooxindoles in excellent diastereoselectivities.
N-炔丙基和N-高聚烯丙基-2-溴-β-色胺经金(I)催化的脱芳香环化反应生成2-溴螺亚吲哚,将其原位水解以单锅法提供螺硫醇。色氨酸衍生物(R 2 = CO 2 Et)在环化作用下以极好的非对映选择性而生成手性螺硫醇。
Selective Palladium(II)-Catalyzed Carbonylation of Methylene β-C−H Bonds in Aliphatic Amines
作者:Jaime R. Cabrera-Pardo、Aaron Trowbridge、Manuel Nappi、Kyohei Ozaki、Matthew J. Gaunt
DOI:10.1002/anie.201706303
日期:2017.9.18
The ligand is key: Palladium(II)-catalyzed C−H carbonylation reactions of methylene C−H bonds in secondary aliphatic amines lead to the formation of trans-disubstituted β-lactams in excellent yields and selectivities. The generality of the C−H carbonylation process is aided by the action of xantphos-based ligands.
NOVEL REVAMIPIDE PRODRUGS, PREPARATION METHOD AND USE THEREOF
申请人:SAMJIN PHARMACEUTICAL CO., LTD.
公开号:US20150141409A1
公开(公告)日:2015-05-21
Disclosed are a novel rebamipide prodrug, a method for preparing the same, and use thereof. Also, a pharmaceutical composition comprising the novel rebamipide prodrug as an active ingredient is provided. The rebamipide prodrug is increased 25-fold in absorption rate compared to rebamipide itself, and can be applied to the prophylaxis or therapy of gastric ulcer, acute gastritis, chronic gastritis, xerophthalmia, cancer, osteoarthritis, rheumatoid arthritis, or obesity.