Fruit Extract of Averrhoa bilimbi: A Green Neoteric Micellar Medium for Isoxazole and Biginelli-Like Synthesis
作者:Bhagyashree M. Patil、Sachinkumar K. Shinde、Ashutosh A. Jagdale、Swati D. Jadhav、Suresh S. Patil
DOI:10.1007/s11164-021-04539-y
日期:2021.10
A transition metal/ligand/additive/promoter-free synthesis of 3-methyl-4-arylmethylene-isoxazol-5(4H)-ones and the Biginelli-like synthesis is carried out in a natural acidic medium of Averrhoa bilimbi extract (ABE) with cleaner and facile approach smentioned here. The isoxazol-5(4H)-ones and 11-acetyl-2-methyl-5,6-dihydro-2H-2,6-methanobenzo[g][1,3,5]-oxadiaazocin-4(3H)-ones are synthesized, respectively, under aerobic conditions at room temperature and at reflux temperature of ethanol. This eco-friendly and economically cheap, non-toxic acidic catalytic media is obtained from the renewable resource, and its dynamic phase is confirmed by the optical microscopy, DLS technique, and with critical micelle concentration (c.m.c.) measurements. The notable advantages are excellent yields of the obtained products, versatility in handling substrates, reuse of the catalyst, use of no hazardous organic solvents, and minimization of waste or side products. So, the reported procedure is simple, evergreen, and a sound alternative to the existing protocols for isoxazol-5(4H)-one synthesis and for Biginelli-like synthesis as well.
一种无过渡金属/配体/添加剂/促进剂的3-甲基-4-芳基亚甲基异噁唑-5(4H)-酮的合成以及类似Biginelli合成在Averrhoa bilimbi提取物(ABE)的天然酸性介质中进行,采用更清洁和更简便的方法。异噁唑-5(4H)-酮和11-乙酰基-2-甲基-5,6-二氢-2H-2,6-亚甲基苯并[g][1,3,5]-噁二唑嗪-4(3H)-酮分别在室温和乙醇回流温度下在有氧条件下合成。该生态友好、经济廉价、无毒的酸性催化介质来源于可再生资源,其动态相通过光学显微镜、动态光散射(DLS)技术和临界胶束浓度(c.m.c.)测量得到确认。显著的优点包括所获得产品的优异产率、底物处理的多样性、催化剂的重复使用、不使用有害有机溶剂以及废物或副产品的最小化。因此,报道的程序简单、环保,并且是现有异噁唑-5(4H)-酮合成和类似Biginelli合成的可靠替代方案。