在钯络合物催化剂的存在下,三氟甲基取代的肉桂酸碳酸丙二酯的烯丙基亲核取代反应在区域和立体选择性上产生了S N 2'产物。在类似的空间环境中,由三氟甲基的极性作用引起的区域化学与甲基化的肉桂基底物相反。与苯基衍生物相比,在空间上更受阻的异丁烯和叔丁基底物也使产物在受阻更严重的位置反应。尽管检查了预期分子内配位会影响区域化学的邻位取代底物,但未检测到其他区域异构体。
methodologies and occurs through a trifluoroacyl radical mechanism promoted by a photocatalyst, which triggers a C−O bond fragmentation. Mechanistic studies (kineticisotopeeffects, spectroelectrochemistry, optical spectroscopy, theoretical investigations) highlight the evidence of a fleeting CF3CO radical under photoredox conditions. The trifluoroacyl radical can be stabilized under CO atmosphere, delivering
我们报告了一种温和且操作简单的烯烃三氟酰化策略,该策略利用三氟乙酸酐作为低成本且易于获得的试剂。这种光介导的过程与传统方法有着根本的不同,它通过由光催化剂促进的三氟酰基自由基机制发生,从而触发 CO 键断裂。机理研究(动力学同位素效应、光谱电化学、光谱学、理论研究)突出了转瞬即逝的 CF 3的证据光氧化还原条件下的 CO 自由基。三氟酰基自由基可以在 CO 气氛下稳定,提供具有更高化学效率的三氟乙酰化产物。此外,该方法可以通过简单地改变反应参数变成三氟甲基化协议。除了简单的烯烃外,该方法还允许小分子药物和常见药效团的化学和区域选择性功能化。
Highly enantioselective copper(<scp>i</scp>)-catalyzed conjugate addition of 1,3-diynes to α,β-unsaturated trifluoromethyl ketones
作者:Amparo Sanz-Marco、Gonzalo Blay、M. Carmen Muñoz、José R. Pedro
DOI:10.1039/c5cc01676b
日期:——
The conjugate diynylation of [small alpha],[small beta]-unsaturated trifluoromethyl ketones is carried out in the presence of a low catalytic load (2.5 mol %) of a copper(I)-MeOBIPHEP complex, triethylamine and a terminal 1,3-diyne....
申请人:CHANGWON NATIONAL UNIVERSITY Industry Academy Cooperation Corps 창원대학교 산학협력단(220040023050) BRN ▼609-82-09745
公开号:KR20200098876A
公开(公告)日:2020-08-21
본 발명은 하기 화학식 1로 표시되는 스티렌 화합물을 하기 화학식 2로 표시되는 카르복시산 무수물과 반응시켜 하기 화학식 3으로 표시되는 α,β-불포화 케톤 화합물을 합성하는 단계를 포함하는 α,β-불포화 케톤 화합물의 제조방법에 대한 것이다: [화학식 1] (상기 화학식에서 R 및 R는 서로 독립적으로 치환 또는 비치환된 알킬, 치환 또는 비치환된 알콕시 또는 치환 또는 비치환된 헤테로알킬임), [화학식 2] (상기 화학식에서 A는 F, Cl, 또는 F 및 Cl이고, n은 1 내지 10임), [화학식 3] .
Enantioselective Alkynylation of Trifluoromethyl Ketones Catalyzed by Cation‐Binding Salen Nickel Complexes
作者:Dongseong Park、Carina I. Jette、Jiyun Kim、Woo‐Ok Jung、Yongmin Lee、Jongwoo Park、Seungyoon Kang、Min Su Han、Brian M. Stoltz、Sukwon Hong
DOI:10.1002/anie.201913057
日期:2020.1.7
Cation-binding salen nickel catalysts were developed for the enantioselective alkynylation of trifluoromethyl ketones in high yield (up to 99 %) and high enantioselectivity (up to 97 % ee). The reaction proceeds with substoichiometric quantities of base (10-20 mol % KOt-Bu) and open to air. In the case of trifluoromethyl vinyl ketones, excellent chemo-selectivity was observed, generating 1,2-addition
The first catalytic enantioselectiveFriedel–Craftsalkylation of indoles with α,β-unsaturated trifluoromethyl ketones has been accomplished. The reaction was achieved in the presence of the Dy(OTf)3/Pybox complex, producing the desired products in high yields (up to 99%) with good enantioselectivities (up to 86% ee). The absolute stereochemistry of the resulting adducts was determined by X-ray analysis