Green Synthesis of Benzopyran-Annulated Thiopyrano[2,3-b]thiochromen-5(4H)-ones by Domino Knoevenagel-Hetero-Diels-Alder Reaction
作者:K. Majumdar、Abu Taher、Sudipta Ponra
DOI:10.1055/s-0030-1258261
日期:2010.12
Benzopyran-annulated thiopyrano[2,3-b]thiochromen-5(4H)-ones have been synthesized by the domino Knoevenagel-hetero-Diels-Alder (DKHDA) reaction of 4-hydroxydithiocoumarin with O-allylated salicylaldehyde and O-propargylated salicylaldehyde in aqueous medium. The reaction requires only a single step operation and is highly regio- and stereoselective providing potentially bioactive polycyclic heterocycles in high yields.
Catalyst-free regioselective synthesis of benzopyran-annulated thiopyrano[2,3-b]thiochromen-5-(4H)-one derivatives by domino-Knoevenagel-hetero-Diels–Alder reaction of terminal alkynes with 4-hydroxy dithiocoumarin in aqueous medium
作者:K.C. Majumdar、Abu Taher、Sudipta Ponra
DOI:10.1016/j.tetlet.2010.02.118
日期:2010.4
benzopyran-annulated thiopyrano[2,3-b] thiochromen-5(4H)-ones has been described by domino-Knoevenagel-hetero-Diels–Alder reaction of 4-hydroxy dithiocoumarin and O-propargylated salicylaldehyde in aqueousmedium and in the absence of any catalyst. The single step reaction is highly regioselective and provides polycyclic heterocycles in high yields.
通过多羟基-Knoevenagel-杂-Diels-4-羟基二硫代香豆素和O-炔丙基化的水杨醛的Alder反应描述了新型五环苯并吡喃环化的吡喃并[2,3 - b ] thiochromen-5(4 H)-的合成。水性介质,并且没有任何催化剂。一步反应是高度区域选择性的,并以高收率提供多环杂环。