Trimolecular Condensation of Substituted Indoles with Paraformaldehyde and Meldrum's Acid. Convective Heating versus Microwave Irradiation. A Comparative Study
作者:Csaba Nemes、Jean-Yves Laronze
DOI:10.1055/s-1999-3395
日期:1999.2
Results obtained in a comparative study on the trimolecular condensation of substituted indoles 1 with paraformaldehyde and Meldrum's acid using convective heating vs. microwave irradiation are described. Both methods afforded adducts 2 together with their hydroxymethylated derivatives 3 in good yields. Although in both cases the yields are about the same, the microwave irradiation was found to be more advantageous, as this procedure makes possible to considerably reduce the reaction times and to obtain cleaner reaction mixtures.
本文介绍了对流加热法与微波辐照法在取代吲哚 1 与多聚甲醛和梅氏酸的三分子缩合反应中进行比较研究的结果。这两种方法都能以良好的收率得到加合物 2 及其羟甲基化衍生物 3。虽然两种方法的产率大致相同,但微波辐照法更具优势,因为这种方法可以大大缩短反应时间,并获得更清洁的反应混合物。