A rapid access to indolo[2,1-a]pyrrolo[4′,3′:4,5]pyrano[5,6-c]coumarin/[6,5-c]chromone derivatives by domino Knoevenagal intramolecular hetero Diels–Alder reactions
作者:Rathna Durga R.S. Manian、Jayadevan Jayashankaran、Raghavachary Raghunathan
DOI:10.1016/j.tetlet.2006.12.106
日期:2007.2
indole-2-carbaldehyde containing an internal dienophile with coumarins, followed by domino intramolecular hetero Diels–Alder reaction, provides polycyclic heterocycles. Different approaches for stereo- and chemoselective synthesis of indolo[2,1-a]pyrrolo[4′,3′:4,5]pyrano[5,6-c]coumarin and indolo[2,1-a]pyrrolo[4′,3′:4,5]pyrano[6,5-c]chromone derivatives are described.
含有内部亲双烯体的吲哚-2-甲醛与香豆素的Knoevenagal缩合反应,然后发生多米诺骨牌分子内杂Diels-Alder反应,形成多环杂环。吲哚[2,1- a ]吡咯[4',3':4,5]吡喃[5,6- c ]香豆素和吲哚[2,1- a ]吡咯[4]的立体和化学选择性合成的不同方法描述了′,3′:4,5]吡喃并[6,5- c ]色酮衍生物。