作者:Lothar W. Bieber、Pedro J. Rolim Neto、Regina M. Generino
DOI:10.1016/s0040-4039(99)00804-7
日期:1999.6
2-Methoxy-1,4-benzoquinone can be alkylated selectively with trialkylboranes in position 5, givinghigh yields of 5-alkyl-2-methoxy-1,4-benzoquinones after oxidative work up. In the case of 2-hydroxy-1,4-naphthoquinone, the same procedure leads to 3-alkylated products. A radical chain mechanism is proposed to explain the observed selectivity.
2-甲氧基-1,4-苯醌可以在位置5处被三烷基硼烷选择性地烷基化,在氧化反应后得到高产率的5-烷基-2-甲氧基-1,4-苯醌。在2-羟基-1,4-萘醌的情况下,相同的步骤可制得3-烷基化的产物。提出了自由基链机理来解释观察到的选择性。