Hydroborations: A New Convenient Route for the Preparation of 4-Alkyl- (or 4-Aryl)chroman-3-ones from 4-Alkyl- (or 4-Aryl)-2<i>H</i>-chromenes
作者:B. S. Kirkiacharian、A. Danan、P. G. Koutsourakis
DOI:10.1055/s-1991-26598
日期:——
Hydroboration followed by pyridinium chlorochromate oxidation of 4-alkyl- and 4-aryl-2H-chromenes [4-alkyl- and 4-aryl-(2H)-1-benzopyrans] lead to the corresponding 4-substituted chroman-3-ones [4-substituted (2H)-1-benzopyran-3(4H)-ones] in good yields.
4- 烷基和 4- 芳基-2H-色烯[4-烷基和 4- 芳基-(2H)-1-苯并吡喃]经氢硼化和吡啶鎓氯铬酸盐氧化后,可以得到相应的 4-取代色满-3-酮[4-取代 (2H)-1-苯并吡喃-3(4H)-酮],收率很高。