The direct sulfanylation of 4-hydroxycoumarins with thiols via C–OH bond activation in water under mild conditions is described, which afforded the corresponding 4-sulfanylcoumarins in good yields.
Efficient synthesis of 4-sulfanylcoumarins from 3-bromo-coumarins<i>via</i>a highly selective DABCO-mediated one-pot thia-Michael addition/elimination process
作者:Vitor B. Mostardeiro、Marina C. Dilelio、Teodoro S. Kaufman、Claudio C. Silveira
DOI:10.1039/c9ra09545d
日期:——
was developed. The transformation took place with aromatic and aliphatic thiols as well as with α,ω-dithiols, affording the expected products in very good to excellent yields. Simple and convenient ways to access4-((ω-mercaptoalkyl) thio)coumarins and the dimeric 4,4′-(alkane-1,4-diylbis(sulfanediyl))bis(coumarins) were also devised with the use of α,ω-alkanedithiols in different ratios with regards