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
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。
Site selective synthesis and anti-inflammatory evaluation of Spiro-isoxazoline stitched adducts of arteannuin B
作者:Javeed Ur Rasool、Gifty Sawhney、Majeed Shaikh、Yedukondalu Nalli、Sreedhar Madishetti、Zabeer Ahmed、Asif Ali
DOI:10.1016/j.bioorg.2021.105408
日期:2021.12
A library of new spiroisoxazoline analogues of arteannuinB was synthesized through 1, 3-dipolar cycloaddition in stereoselective fashion and consequently screened for anti-inflammatory activity in RAW 264.7 macrophage cells. Three potent analogues (8i, 8 m, and 8n) were found to attenuate the LPS induced release of cytokines IL-6 and TNF-α more potently than the parent molecule. Also, the inhibition
青蒿素 B 的新螺异恶唑啉类似物文库通过 1, 3-偶极环加成以立体选择性方式合成,因此筛选 RAW 264.7 巨噬细胞的抗炎活性。发现三种有效的类似物(8i、8m和8n)比母体分子更有效地减弱 LPS 诱导的细胞因子 IL-6 和 TNF-α 的释放。此外,在这些细胞中对 LPS 诱导的一氧化氮产生的抑制显示出中等至高效的功效。在孵育 48 小时后,这三种有效分子均未改变 RAW 264.7 细胞的活力,这表明细胞中表现出的细胞因子和一氧化氮产生的抑制不是由于毒性。此外,这些化合物的 IC 50范围为 0.17 µM-1.57 µM 和 0.09 µM-0.35 µM,分别用于抑制 IL-6 释放和一氧化氮产生。结果揭示了对促炎介质的有效抑制,这是令人鼓舞的并且值得进一步研究以开发用于炎性疾病的新治疗剂。
Design, synthesis and SAR of a novel series of heterocyclic phenylpropanoic acids as GPR120 agonists
A novelseries of 5-membered heterocycle-containing phenylpropanoic acid derivatives was discovered as potent GPR120 agonists with low clearance, high oral bioavailability and in vivo antidiabetic activity in rodents.