Scandium-Catalyzed Propargylation of 1,3-Diketones with Propargyl Alcohols Bearing Sulfur or Selenium Functional Groups: Useful Transformation to Furans and Pyrans
作者:Katsuki Ohta、Taira Kobayashi、Genzoh Tanabe、Osamu Muraoka、Mitsuhiro Yoshimatsu
DOI:10.1248/cpb.58.1180
日期:——
Propargylations of 1,3-diketones using 3-sulfanyl and 3-selanylpropargyl alcohols 1 in MeNO2–H2O gave alkynyl ketones 2a—m, 2o—v and 6,7-dihydro-5H-cyclohexa[b]pyran-5-ones 3k—n. With some bases, the useful propargylated 1,3-diketones underwent intramolecular cyclization to give 6,7-dihydro-5H-benzofuran-4-ones 4a—i or 4,5,6,7-tetrahydrobenzofurans 5p, 6p—v.
使用3-硫基和3-硒基丙炔醇1在MeNO2-H2O中对1,3-二酮进行丙炔化反应,得到了烷炔酮2a—m、2o—v以及6,7-二氢-5H-环己[b]吡喃-5-酮3k—n。与一些碱反应时,有效的丙炔化1,3-二酮发生分子内环化,生成6,7-二氢-5H-苯并呋喃-4-酮4a—i或4,5,6,7-四氢苯并呋喃5p、6p—v。