1,3-Dipolar cycloaddition of enantiopure γ-oxygenated-α,β-unsaturated phenyl sulfones with nitrile oxides
作者:Jesús de Blas、Juan C. Carretero、Esteban Domínguez
DOI:10.1016/0957-4166(95)00118-9
日期:1995.5
reactions occurred at room temperature with moderate yields (31–65%), complete regioselectivity in favour of the isoxazolines with the phenylsulfonyl group at C-4, and moderate or high anti-stereoselectivity. After reductive elimination of the sulfonyl group and further reduction of NO bond, enantiomerically pure β-hydroxyketones or 1,3-aminoalcohols were obtained.
研究了几种对映体纯的γ-氧化的α,β-不饱和砜与乙腈和苄腈氧化物的1,3-偶极环加成反应。该反应在室温下以中等收率(31–65%)发生,完全区域选择性有利于具有在C-4处具有苯磺酰基的异恶唑啉,并且具有中等或较高的抗立体选择性。还原性消除磺酰基并进一步还原N = O键后,得到对映体纯的β-羟基酮或1,3-氨基醇。