BF<sub>3</sub>·OEt<sub>2</sub> catalyzed chemoselective CC bond cleavage of α,β-enones: an unexpected synthesis of 3-alkylated oxindoles and spiro-indolooxiranes
作者:Sengodagounder Muthusamy、Ammasi Prabu
DOI:10.1039/d1ob02002a
日期:——
of α,β-enones with diazoamides for the synthesis of 3-alkylated oxindoles is developed. Boron trifluoride etherate is found to be an effective catalyst for the chemoselective Cα–Cβ cleavage of enones to obtain 3-alkylated oxindoles. The product formation indicates a selective β-carbon elimination pathway of α,β-enones using the inexpensive BF3·OEt2 as a catalyst, transition metal-free conditions, an
开发了一种BF 3 ·OEt 2催化的α,β-烯酮与重氮酰胺的高化学选择性形式C C双键裂解反应,用于合成3-烷基化羟吲哚类化合物。发现三氟化硼醚合物是化学选择性 C α -C β裂解烯酮以获得 3-烷基化羟吲哚的有效催化剂。产物的形成表明以廉价的BF 3 ·OEt 2为催化剂, α,β-烯酮的选择性β-碳消除途径,无过渡金属条件,露天环境,良好的功能耐受性和广泛的底物范围。该协议的合成效用通过合成螺吲哚环氧乙烷来突出。