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 aqueous medium 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。