首页> 外文期刊>Chemistry: A European journal >Asymmetric Conjugate Reduction of alpha,beta-Unsaturated Ketones and Esters with Chiral Rhodium(2,6-bisoxazolinylphenyl) Catalysts
【24h】

Asymmetric Conjugate Reduction of alpha,beta-Unsaturated Ketones and Esters with Chiral Rhodium(2,6-bisoxazolinylphenyl) Catalysts

机译:手性铑(2,6-二恶唑啉基苯基)催化剂不对称共轭还原α,β-不饱和酮和酯

获取原文
获取原文并翻译 | 示例
           

摘要

New asymmetric conjugate reduction of beta,beta-disubstituted alpha,beta-unsa-turated ketones and esters was accomplished with alkoxylhydrosilanes in the presence of chiral rhodium(2,6-bisoxa-zolinylphenyl) complexes in high yields and high enantioselectivity.(E)-4-Phenyl-3-penten-2-one and (E)-4-phenyl-4-isopropyl-3-penten-2-one were readily reduced at 60 deg C in 95 % ee and 98% ee,respectively,by 1 mol% of catalyst loading.(EtO)_2MeSiH proved to be the best hydrogen donor of choice.tert-Butyl (E)-beta-methylcinna-mate and beta-isopropylcinnamate could also be reduced to the corresponding dihydrocinnamate derivatives up to 98% ee.
机译:在手性铑(2,6-二氧杂-唑啉基苯基)络合物的存在下,用烷氧基氢硅烷以高收率和高对映选择性实现了β,β-二取代的α,β-不饱和取代的酮和酯的新不对称共轭还原。分别在60%的温度下(95%ee和98%ee)还原-4-苯基-3-戊烯-2-酮和(E)-4-苯基-4-异丙基-3-戊烯-2-酮(EtO)_2MeSiH被证明是最佳的氢供体。叔丁基(E)-β-甲基肉桂酸酯和β-异丙基肉桂酸酯也可以还原为相应的二氢肉桂酸酯衍生物,最高可达98 %ee。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号