Enantioselective allylic oxidation catalyzed by chiral bisoxazoline-copper complexes
作者:Abha S. Gokhale、Alexander B.E. Minidis、Andreas Pfaltz
DOI:10.1016/0040-4039(95)00140-8
日期:1995.3
Copper(I) complexes prepared in situ from chiral bisoxazolines and Cu(I)OTf have been studied as catalysts for the allylic oxidation of cycloalkenes. Using 5 mol% of catalyst and tertbutyl perbenzoate as oxidant, optically active 2-cycloalkenyl benzoates were obtained in moderate to good yields. The highest enantiomeric excesses, 74% at 23 °C and up to 84% at lower temperatures, were observed for cyclopentene
已经研究了由手性双恶唑啉和Cu(I)OTf原位制备的铜(I)配合物作为环烯烃烯丙基氧化的催化剂。使用5mol%的催化剂和过苯甲酸叔丁酯作为氧化剂,以中等至良好的产率获得了光学活性的2-环烯基苯甲酸酯。对环戊烯和环庚烯的对映体过量最高,在23°C时高达74%,在较低温度下高达84%,而环己烯的选择性较低,介于64–77%ee之间。