A New Facile Approach to the Synthesis of 3-Methylthio-Substituted Furans, Pyrroles, Thiophenes, and Related Derivatives
作者:Guodong Yin、Zihua Wang、Aihua Chen、Meng Gao、Anxin Wu、Yuanjiang Pan
DOI:10.1021/jo702585s
日期:2008.5.1
the Paal−Knorr furansynthesis. Meanwhile, 4-bromo-3-methylthio 2,5-diaryl furan 10 is obtained either by the treatment of furan 7 with molecular bromine or by the treatment of diketone 3 with 30% hydrogen bromide in acetic acid solution in one pot. Removal of the methylthio group is accomplished by the treatment of 7 with Raney Ni in ethanol, which affords the diaryl-substituted furan 11 in excellent