Enantioselective Synthesis of Functionalized 1-Benzoxepines by Phenoxide Ion Mediated 7-<i>endo</i>-<i>tet</i>Carbocyclization of Cyclic Sulfates
作者:Sajal Kumar Das、Subal Kumar Dinda、Gautam Panda
DOI:10.1002/ejoc.200800661
日期:2009.1
A new asymmetric synthesis of 2,3-disubstituted 1-benzoxepines is described. Key steps include Sharpless asymmetricdihydroxylation of trans-α,β-unsaturated esters and phenoxide ion mediated intramolecular 7-endo-tet carbocyclization of syn-2,3-dihydroxy ester derived cyclic sulfates. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)
描述了一种新的 2,3-二取代 1-苯并氧杂环庚烷的不对称合成。关键步骤包括反式-α,β-不饱和酯的 Sharpless 不对称二羟基化和苯氧离子介导的分子内 7-endo-tet 碳环化 Syn-2,3-二羟基酯衍生的环状硫酸盐。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)