A catalyst-free 1,4-Michael-type reaction of in situ generated ortho-quinone methides (o-QMs) with dithiocarbamic acid salts in water
作者:Fezzeh Aryanasab、Meisam Shabanian
DOI:10.1007/s13738-019-01644-z
日期:2019.8
catalyst-free conjugate addition of dithiocarbamicacid salts to in situ generated ortho-quinone methides (o-QMs) was investigated for the first time. Several dithiocarbamate derivatives of 4-hydroxycoumarine, 4-hydroxypyrone and 2-naphthol were synthesized in moderate-to-good yields in water at room temperature. Graphical abstract Catalyst-free addition of dithiocarbamicacid salts to in situ generated o-QMs
dithiocarbamic acid salts with trimethyl orthoformate in the presence of BF3·OEt2 was investigated to give 4-(N,N-dialkyldithiocarbamato)-2-dialkyliminio-1,3-dithietane tetrafluoroborates in good yields. Additionally, a one-pot procedure for the synthesis of 2-iminium-1,3-dithiolanes from the BF3·OEt2 catalyzed reaction of dithiocarbamic acid salts with styrene epoxide is described.