Synthesis of Indolizines and Benzoindolizines by Annulation of Donor-Acceptor Cyclopropanes with Electron-Deficient Pyridines and Quinolines
作者:Nicholas A. Morra、Christian L. Morales、Barbora Bajtos、Xin Wang、Hyosook Jang、Jian Wang、Ming Yu、Brian L. Pagenkopf
DOI:10.1002/adsc.200600298
日期:2006.11
The formal [3+2] dipolar cycloaddition (or annulation) of donor-acceptor cyclopropanoate esters with pyridines and 5-nitroquinoline is reported. Electron-deficient pyridine dipolarophiles (R=CN, CO2Et, COMe) participate in the annulation whereas electron rich species do not. The product 2,3-dihydroindolizines undergo rapid autooxidation, and the X-ray structures for two of the aromatic products are
报道了供体-受体环丙酸酯与吡啶和5-硝基喹啉的正式[3 + 2]偶极环加成(或环化)。缺电子吡啶双极性亲核试剂(R = CN,CO 2 Et,COMe)参与环化,而富电子物种则不参与。产物2,3-二氢吲哚并迅速经历自氧化作用,并且报道了两种芳族产物的X射线结构。