[EN] ARYLPYRAZOLES AND ARYLISOXAZOLES AND THEIR USE AS PKD MODULATORS [FR] ARYLPYRAZOLES ET ARYLISOXAZOLES ET LEUR UTILISATION EN TANT QUE MODULATEURS DE LA PROTÉINE KINASE C (PKD)
NOVEL PHENYLPROPIONIC ACID DERIVATIVES AS PEROXISOME PROLIFERATOR-ACTIVATED GAMMA RECEPTOR MODULATORS, METHOD OF THE SAME, AND PHARMACEUTICAL COMPOSITION COMPRISING THE SAME
Terminal Alkyne-Assisted One-Pot Synthesis of Arylamidines: Carbon Source of the Amidine Group from Oxime Chlorides
作者:Fengping Yi、Qihui Sun、Jing Sun、Chao Fu、Weiyin Yi
DOI:10.1021/acs.joc.9b00538
日期:2019.6.7
a diverse range of arylamidines from a novel cascade reaction of in situ generated nitrileoxides, sulfonyl azides, terminal alkynes, and water by [3 + 2] cycloaddition and ring opening sequence was developed. The use of aryl oxime chlorides as the carbon source of the amidine group and the addition of water proved to be critical for the reaction. Moreover, terminal alkynes, which can lead to high yields
A convenient, efficient protocol to prepare diverse spiroisoxazolino-diketopiperazines via a parallel solid-supported synthesis was developed. The key steps are (1) a coupling reaction of an amino acid; (2) tosylation with concomitant β-elimination to form an α, β-unsaturated ester; (3) a 1,3-dipolarcycloaddition with an oxime to form isoxazoline rings; and (4) cyclic cleavage to release the product
Synthesis of 3,5-Disubstituted Isoxazoles Containing Privileged Substructures with a Diverse Display of Polar Surface Area
作者:Mingi Kim、Yoon Soo Hwang、Wansang Cho、Seung Bum Park
DOI:10.1021/acscombsci.7b00032
日期:2017.6.12
substituents which uniquely display polar surface area in a diverse manner. A library of 3,5-disubstituted isoxazoles were systematically prepared via 1,3-dipolar cycloaddition of alkynes with nitrile oxides prepared by two complementary synthetic routes; method A utilized a halogenating agent with a base and method B utilized a hypervalent iodine reagent. Through the biological evaluation of corresponding
3-chloropropyne. Another key intermediate product is 1,3-dipole, which can be obtained fromaromaticaldehyde. After treatment with hydroxylamine hydrochloride and then sodium carbonate solution, aromaticaldehyde is converted to aldehyde oxime, which reacts with N-chlorosuccinimide (NCS) to afford aryl hydroximino chloride. 1,3-Dipole is eventually formed in situ while triethylamine (TEA) in DMF is added dropwise
摘要 以青藤碱盐酸盐和芳香醛为原料合成了一种新型结构的青藤碱异恶唑衍生物,需要六个步骤。以良好的收率获得了19个目标化合物。青藤碱盐酸盐在与氨中和反应和与3-氯丙炔取代反应后转化为4-炔基青藤碱,这是合成目标青藤碱异恶唑化合物的关键中间产物。另一个关键的中间产物是 1,3-偶极子,它可以从芳香醛中获得。用盐酸羟胺和碳酸钠溶液处理后,芳香醛转化为醛肟,与 N-氯代琥珀酰亚胺 (NCS) 反应生成芳基羟氨基氯化物。1,3-偶极子最终原位形成同时滴加 DMF 中的三乙胺 (TEA)。然后加入4-炔基青藤碱,通过1,3-偶极环加成反应作为关键步骤提供青藤碱异恶唑衍生物。所有目标化合物均通过熔点、1 H NMR、13 C NMR、HRMS和FT-IR光谱进行表征。
Catalytic Enantioselective [3 + 2] Cycloaddition of α-Keto Ester Enolates and Nitrile Oxides
作者:Samuel L. Bartlett、Yoshihiro Sohtome、Daisuke Hashizume、Peter S. White、Miki Sawamura、Jeffrey S. Johnson、Mikiko Sodeoka
DOI:10.1021/jacs.7b03782
日期:2017.6.28
An enantioselective [3 + 2] cycloaddition reaction between nitrileoxides and transiently generated enolates of α-keto esters has been developed. The catalyst system was found to be compatible with in situ nitrile oxide-generation conditions. A versatile array of nitrileoxides and α-keto esters could participate in the cycloaddition, providing novel 5-hydroxy-2-isoxazolines in high chemical yield