A Facile and Efficient Synthesis of Thieno[2,3-<i>c</i>]furans and Furo[3,4-<i>b</i>]indoles via a Pummerer-Induced Cyclization Reaction
作者:C. Oliver Kappe、Albert Padwa
DOI:10.1021/jo9607929
日期:1996.1.1
acid-catalyzed ring-opening and aromatization to give heteroaromatic naphthalene derivatives. This one-pot procedure occurs smoothly with electron-deficient dienophiles. The tandem Pummerer cyclization-cycloaddition sequence also occurs intramolecularly using unactivated alkenyl tethers of variable length. With acetylenic dienophiles, the primary cycloadducts undergo in situ ring-opening to produce hydroxynaphthalene