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.
Domino-Knoevenagel-hetero-Diels–Alder reactions: an efficient one-step synthesis of indole-annulated thiopyranobenzopyran derivatives
作者:K.C. Majumdar、Abu Taher、Krishanu Ray
DOI:10.1016/j.tetlet.2009.04.054
日期:2009.7
Rapid one-step synthesis of hitherto unreported indole-annulated pentacyclic heterocyclescontaining oxygen, nitrogen, and sulfur has been described by domino-Knoevenagel-hetero-Diels–Alder reaction. The reaction sequence provides a route to the synthesis of a novel type of polyheterocycles in excellent yields with high stereoselectivity.
Regioselective Synthesis of Chromeno[4′,3′:4,5]pyrano[3,2-c][1,8]naphthyridin-13-one Derivatives by Domino Knoevenagel-Hetero-Diels-Alder Reactions
作者:K. Majumdar、Abu Taher、Sudipta Ponra
DOI:10.1055/s-0030-1260254
日期:2011.11
Efficientsynthesis of chromeno[4′,3′:4,5]pyrano[3,2-c][1,8]naphthyridin-13-one derivatives has been described by domino Knoevenagel-hetero-Diels-Alder reaction of 4-hydroxy-1-phenyl-1,8-naphthyridin-2(1H)-one with O-allylated/propargylated salicylaldehydes. The reaction occurs in a single step and is highlyregio- and stereoselective giving polycyclic heterocycles in high yields. 1,8-naphthyridine
色烯的有效合成[4',3':4,5]吡喃并[3,2- c ^ ] [1,8]萘啶-13-酮衍生物已经通过4-多米诺的Knoevenagel-杂Diels-Alder反应中所述羟基-1-苯基-1,8-萘啶-2(1 H)-1与O-烯丙基化/炔丙基化的水杨醛。该反应在单个步骤中发生,并且是高度区域和立体选择性的,从而以高收率得到多环杂环。 1,8-萘啶-Knoevenagel反应-杂-Diels-Alder反应-乙二胺二乙酸二铵-区域选择性-立体选择性-未活化的烯烃-未活化的炔烃