Asymmetric Desymmetrization of 4,5-Epoxycyclohex-1-ene by Enantioselective Allylic Oxidation
作者:Qitao Tan、Masahiko Hayashi
DOI:10.1021/ol901284v
日期:2009.8.6
Asymmetric desymmetrization of allylic oxidation of 4,5-epoxycyclohex-1-ene (1) took place in the presence of 2.5 mol % of Cu(CH3CN)4PF6 and 3 mol % of chiral N,N-bidentate ligand (S)-2 to afford (3S,4S,5S)-3-benzoyloxy-4,5-epoxycyclohex-1-ene (3) in 84% ee, which was increased up to >99% ee after recrystallization of 3-4′-nitrobenzoyloxy derivative 6. Optically pure 6 proved to be a key intermediate
在存在2.5 mol%的Cu(CH 3 CN)4 PF 6和3 mol%的手性N,N-双齿配体(4)的情况下,发生了4,5-环氧环己-1-烯(1)的烯丙基氧化的不对称脱对称。S)-2得到84%ee的(3 S,4 S,5 S)-3-苯甲酰氧基-4,5-epoxycyclohex-1-ene(3),经重结晶后增加至> 99%ee 3-4′-硝基苯甲酰氧基衍生物6。光学纯6被证明是O对映选择性合成的关键中间体保护2-脱氧链胺(2-DOS)的前体12。