Regio- and Stereoselective Ring Opening of ω-Alkenyllactones Using Organocopper Reagents
作者:Masatoshi Kawashima、Toshio Sato、Tamotsu Fujisawa
DOI:10.1246/bcsj.61.3255
日期:1988.9
by the regio- and stereoselective ring opening of β, γ, and δ-lactones with unsaturated substituents at the ω-position using organocopper reagents such as halomagnesium diorganocuprates or Grignard reagents in the presence of copper(I) iodide. Both the organocopper reagents with primary, secondary, tertiary alkyl, and phenyl groups gave the corresponding carbon homologated alkenoic acids in good yields
描述了通过 β、γ 和 δ-内酯的区域和立体选择性开环来制备 (E)-3-、(E)-4- 和 (E)-5- 烯酸的新合成方法在碘化铜 (I) 存在下,使用有机铜试剂如卤化二有机铜酸盐或格氏试剂在 ω 位去除不饱和取代基。具有伯、仲、叔烷基和苯基的有机铜试剂均以良好的产率得到相应的碳同系链烯酸。通过 ω-烯基内酯与二乙烯基-和二烯丙基铜酸盐的反应,也以良好的产率获得链二烯酸。利用β-异丙烯基-β-丙内酯的开环,很容易以良好的收率获得高萜类羧酸。