Catalytic Asymmetric Oxidation of Heteroaromatic Sulfides with tert-Butyl Hydroperoxide Catalyzed by a Titanium Complex with a New Chiral 1,2-Diphenylethane-1,2-diol Ligand
作者:Biao Jiang、Xiao-Long Zhao、Jia-Jia Dong、Wan-Jun Wang
DOI:10.1002/ejoc.200801139
日期:2009.3
Heteroaromatic sulfoxides, especially 1H-benzimidazolyl pyridinylmethyl sulfoxides, usually used as the blockbuster gastric proton pump inhibitors (PPIs), have been prepared highly enantioselectivily by catalytic asymmetric oxidation of sulfides attached to nitrogen-containing heterocyles with tert-butyl hydroperoxide in the presence of a chiral titanium complex, formed in situ from Ti(iPrO)(4), chiral 1,2-diphenylethane-1
杂芳族亚砜,尤其是 1H-苯并咪唑基吡啶基甲基亚砜,通常用作重磅胃质子泵抑制剂 (PPI),通过在氢过氧化叔丁基存在下催化不对称氧化与含氮杂环相连的硫化物,高度对映选择性地制备手性钛络合物,由 Ti(iPrO)(4)、手性 1,2-二苯基乙烷-1,2-二醇 3c 和水原位形成。手性亚砜以高产率 (97%) 获得,对映体过量 (尖端达到 98%)。((c) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)