Metallation of Phosphorylated Aliphatic Alcohols to Configurationally Stable α-Oxyalkyllithium Compounds − Use of the Phosphoryl Group as an Activating Group and Electrophile
Alkyl diisopropyl phosphates were metallated by sBuLi/TMEDA at −78 °C at the alkyl and isopropyl group in a ratio which is strongly influenced by steric effects. The regioselectivity of deprotonation was very high by use of heptadeuterioisopropyl groups, which reflects a high primary kinetic isotopeeffect (kH/kD ⩾ 100). The dipole-stabilized, phosphoryloxy-substituted alkyllithium compounds formed
烷基二异丙基磷酸酯在 -78 °C 下通过 sBuLi/TMEDA 在烷基和异丙基上金属化,其比例受空间效应的影响很大。通过使用七氘异丙基团,去质子化的区域选择性非常高,这反映了高初级动力学同位素效应(kH / kD ⩾ 100)。形成的偶极稳定的、磷酰氧基取代的烷基锂化合物构型稳定,重排时保留构型(磷酸盐-膦酸盐重排)。