描述了一种温和且操作简单的铜催化乙烯基有氧氧化 β,γ-和 α,β-不饱和酯。该方法具有收率好、底物范围广、化学选择性和区域选择性好、官能团耐受性好等特点。该方法还能够氧化β,γ-和α,β-不饱和醛、酮、酰胺、腈和砜。此外,本催化体系适用于双乙烯基和三乙烯基氧化。发现四甲基胍 (TMG) 作为碱的作用至关重要,但我们也推测它可以作为三氟甲磺酸铜 (II) 的配体来生产活性铜 (II) 催化剂。进行的机械实验表明,通过烯丙基铜 (II) 物质存在一个合理的反应途径。最后,
描述了一种温和且操作简单的铜催化乙烯基有氧氧化 β,γ-和 α,β-不饱和酯。该方法具有收率好、底物范围广、化学选择性和区域选择性好、官能团耐受性好等特点。该方法还能够氧化β,γ-和α,β-不饱和醛、酮、酰胺、腈和砜。此外,本催化体系适用于双乙烯基和三乙烯基氧化。发现四甲基胍 (TMG) 作为碱的作用至关重要,但我们也推测它可以作为三氟甲磺酸铜 (II) 的配体来生产活性铜 (II) 催化剂。进行的机械实验表明,通过烯丙基铜 (II) 物质存在一个合理的反应途径。最后,
Indole-Catalyzed Bromolactonization in Lipophilic Solvent: A Solid–Liquid Phase Transfer Approach
作者:Tao Chen、Thomas Jian Yao Foo、Ying-Yeung Yeung
DOI:10.1021/acscatal.5b01182
日期:2015.8.7
We have developed a novel indole-catalyzed bromolactonization of olefinic acids. The reaction could be conducted in lipophilic solvent through a solid liquid phase transfer mechanism. This catalytic protocol has been applied to the synthesis of base-sensitive bromolactones.
Synthesis of chiral butenolides using amino-thiocarbamate-catalyzed asymmetric bromolactonization
作者:Chong Kiat Tan、Jun Cheng Er、Ying-Yeung Yeung
DOI:10.1016/j.tetlet.2014.01.009
日期:2014.2
The asymmetric cyclization of 4,4-disubstituted 3-butenoic acids is studied. Amino-thiocarbamates are used as the catalysts and N-bromosuccinimide is used as the stoichiometric halogen source. The resulting gamma-butanolide products are readily converted into the corresponding gamma-butenolides (up to 58% ee) derivatives in one-pot. (C) 2014 Elsevier Ltd. All rights reserved.