Synthesis of Multisubstituted 2-Aminopyrroles/pyridines via Chemoselective Michael Addition/Intramolecular Cyclization Reaction
作者:Xueyu Qi、Haoyue Xiang、Qian He、Chunhao Yang
DOI:10.1021/ol5018855
日期:2014.8.15
A facile and efficient synthetic strategy to construct polysubstituted 2-aminopyrroles/pyridines was developed via chemoselective Michaeladdition/intramolecular cyclization reaction under very mild conditions. It suggested that the chemoselectivity of the process could be controlled by the leaving ability of the halides.
[EN] 2- (3-AMINOPYRROLIDIN-1-YL) PYRIDINES AS MELANIN-CONCENTRATING HORMONE RECEPTOR AN TAGONISTS<br/>[FR] 2- (3-AMINOPYRROLIDIN-1-YL) PYRIDINES UTILISEES COMME ANTAGONISTES DU RECEPTEUR DE L'HORMONE CONCENTRANT LA MELANINE, ET COMPOSITIONS ET PROCEDES ASSOCIES
申请人:NEUROCRINE BIOSCIENCES INC
公开号:WO2005103039A1
公开(公告)日:2005-11-03
Melanin-concentrating hormone (MCH) receptor antagonists are disclosed having utility for the treatment of MCH receptor-based disorders such as obesity. The compounds of this invention have the following structure: including stereoisomers, prodrugs, and pharmaceutically acceptable salts thereof, wherein R1, R2, R5, Het, X and Cyc are as defined herein. Also disclosed are compositions containing a compound of this invention, as well as methods relating to the use thereof.
N-(4-Substituted-thiazolyl)oxamic acid derivatives, new series of potent, orally active antiallergy agents
作者:Karl D. Hargrave、Friedrich K. Hess、James T. Oliver
DOI:10.1021/jm00362a014
日期:1983.8
showed a 50% inhibition at less than 2 mg/kg po or less than 0.4 mg/kg iv and were significantly more potent than disodium cromoglycate, which in the rat PCA model is orally inactive and gives a 50% inhibition at 1.2 mg/kg iv. Hydrolysis of the oxamates generally resulted in enhanced activities, while substitution of the phenyl ring with a variety of substituents (e.g., 4-F, 4-OEt, and 4-NHCOCH3) did
合成了一系列的N-(4-取代的噻唑基)草酰胺酸衍生物,并在大鼠PCA模型中测试了其抗过敏活性。这些化合物可通过用硫脲和碘处理适当的苯乙酮或使氯乙酰苯与硫脲反应生成相应的氨基噻唑来方便地制备。随后与乙二酰氯缩合,得到噻唑基草酸酯。许多类似物在低于2 mg / kg po或低于0.4 mg / kg iv时显示出50%的抑制作用,并且比色甘酸二钠显着更有效,后者在大鼠PCA模型中是口服失活的,并在50%时抑制。 1.2 mg / kg iv。草酸盐的水解通常会增强活性,而苯环则被各种取代基(例如4-F,4-OEt,和4-NHCOCH 3)没有显着增强未取代苯基衍生物的活性。已选择一种乙醇胺盐,N- [4-(1,4-苯并二恶烷-6-基)-2-噻唑基]乙酰胺酸乙醇胺盐(61,PRH-836-EA)进行进一步的药理评估。
Chiral FLP-catalyzed asymmetric hydrogenation of 3-fluorinated chromones
作者:Yun Dai、Wei Meng、Xiangqing Feng、Haifeng Du
DOI:10.1039/d1cc06964k
日期:——
The asymmetrichydrogenation of fluorinated olefins is an efficient pathway towards the synthesis of chiral fluorine-containing compounds. This paper described metal-free asymmetrichydrogenation of 3-fluorinated chromones with the use of readily available achiral borane and chiral oxazoline as an FLP catalyst for the first time. A variety of optically active 3-fluorochroman-4-ones were obtained in
氟化烯烃的不对称氢化是合成手性含氟化合物的有效途径。本文首次描述了使用容易获得的非手性硼烷和手性恶唑啉作为 FLP 催化剂的 3-氟化色酮的无金属不对称氢化。以高达 88% ee 的高产率获得了多种光学活性 3-fluorochroman-4-one。
Complex induced proximity effect enhancement in α-silyl carbanion generation. A general conversion of 2-silyl benzamides into 2-fluorosilylacetophenones
作者:Paul A. Brough、Stephen Fisher、Baoping Zhao、Ryan C. Thomas、Victor Snieckus
DOI:10.1016/0040-4039(96)00446-7
日期:1996.4
LDA treatment of 2-silylated benzamides 1 affords 2-fluorosilylated acetophenones 3 in a general process likely driven by CIPE-facilitated α-silylcarbanion formation and rearrangement (Scheme 3); oxidation (H2O2) of the products gives 2-hydroxyacetophenones and catechols (Scheme 4).
LDA处理2-甲硅烷基化的苯甲酰胺1在一般过程中可能由CIPE促进的α-甲硅烷基碳负离子的形成和重排驱动生成2-氟甲硅烷基化的苯乙酮3 (方案3);产物的氧化(H 2 O 2)得到2-羟基苯乙酮和儿茶酚(方案4)。