In situ protection methodology for selective one-pot allylation and alkylation of ketones in the presence of α,β-unsaturated ketones
作者:Kei Watanabe、Reiya Ohta、Kenta Morita、Kenzo Yahata、Masaki Minami、Hiromichi Fujioka
DOI:10.1016/j.tet.2016.03.063
日期:2016.5
Selective one-pot alkylation or allylation of ketones in the presence of α,β-unsaturated ketones (enones) were accomplished by using our in situ protection methodology. Enones selectively react with a combination of PPh3 and silyl triflates in the presence of ketones to produce phosphonium silyl enol ethers, which act as protective groups for the enones during the alkylation or allylation of ketones
通过使用我们的原位保护方法,可以在存在α,β-不饱和酮(烯酮)的情况下对酮进行选择性一锅烷基化或烯丙基化。酮在酮的存在下,与PPh 3和甲硅烷基三氟甲磺酸酯的组合选择性反应,生成yl甲硅烷基烯醇醚,在酮的烷基化或烯丙基化过程中,其作为烯酮的保护基,并且很容易脱保护以再生母体酮在工作中。