Complete Reversal in Regioselectivity in the Baeyer−Villiger Reaction of an α-CF3-Ketone and Theoretical Rationale for Axial Orientation of Sterically Demanding CF3 Group at the Transition State
摘要:
[GRAPHICS]The regioselectivity of the Baeyer-Villiger reaction of alpha-CF3-ketone is completely reversed from that in alpha-F-eq-ketone. Theoretical study rationalized that the reaction proceeds with the sterically demanding CF3 group in an axial orientation by strong dipole interaction. The guiding principle that strong dipole interaction can overcome steric repulsion as a determining factor not only in regio- but also in stereocontrol is proposed.
Radical Desulfur‐Fragmentation and Reconstruction of Enol Triflates: Facile Access to α‐Trifluoromethyl Ketones
作者:Xiaolong Su、Honggui Huang、Yaofeng Yuan、Yi Li
DOI:10.1002/anie.201608507
日期:2017.1.24
efficient oxidative radical desulfur‐fragmentation and reconstruction of enoltriflates for the synthesis of α‐CF3 ketones. Preliminary mechanistic studies disclosed that oxidative fragmentation to release a CF3 radical from the triflyl group of enoltriflate and subsequent addition of the CF3 radical to another enoltriflate form the desired α‐CF3 ketones. This method provides a new approach to α‐CF3
[EN] SUBSTITUTED UREA AND CARBAMATE, PHENACYL-2-HYDROXY-3-DIAMINOALKANE, AND BENZAMIDE-2-HYDROXY-3-DIAMINOALKANE ASPARTYL-PROTEASE INHIBITORS<br/>[FR] UREE ET CARBAMATE SUBSTITUES, PHENACYL-2-HYDROXY-3-DIAMINOALCANE, ET BENZAMIDE-2-HYDROXY-3-DIAMINOALCANE INHIBITEURS D'ASPARTYL-PROTEASE
申请人:ELAN PHARM INC
公开号:WO2005087215A1
公开(公告)日:2005-09-22
The invention relates to acetyl 2-hydroxy-1,3-diaminospirocyclohexanes and derivatives thereof that are useful in treating at least one disease, disorder, and condition associated with amyloidosis. Amyloidosis refers to a collection of diseases, disorders, and condition associated with abnormal deposition of A-beta protein.
Direct C(sp
<sup>3</sup>
)−H Trifluoromethylation of Unactivated Alkanes Enabled by Multifunctional Trifluoromethyl Copper Complexes
作者:Geunho Choi、Geun Seok Lee、Beomsoon Park、Dongwook Kim、Soon Hyeok Hong
DOI:10.1002/anie.202012263
日期:2021.3
photoinduced reaction, the source of a trifluoromethyl radical as a hydrogen atom transfer reagent, and the source of a trifluoromethyl anion for functionalization. The reaction was initiated by the generation of reactive electrophilic carbon‐centered CF3 radical through photoinduced homolytic cleavage of bpyCu(CF3)3, followed by hydrogenabstraction from an unactivated C(sp3)−H bond. Comprehensive mechanistic
Csp<sup>3</sup>–H Trifluoromethylation of Unactivated Aliphatic Systems
作者:Jiachen He、Truong N. Nguyen、Shuo Guo、Silas P. Cook
DOI:10.1021/acs.orglett.0c03891
日期:2021.2.5
method for the undirected trifluoromethylation of unactivated methylene units was developed. The reaction proceeds in aqueous acetonitrile with Grushin’s reagent, bpyCu(CF3)3, under broad-spectrum white-light irradiation. The trifluoromethylation tolerates a wide range of functional groups including ketones, esters, nitriles, amides, alcohols, and carboxylic acids. The C–H cleavage step is performed
开发了一种用于未活化亚甲基单元的非定向三氟甲基化的简单方法。该反应在乙腈水溶液中与 Grushin 试剂 bpyCu(CF 3 ) 3在广谱白光照射下进行。三氟甲基化可耐受多种官能团,包括酮、酯、腈、酰胺、醇和羧酸。C-H 裂解步骤是通过分子间 H 原子抽象进行的,并且报告了在一系列亚甲基单元上的选择性。机理研究为整体转化提供了一般反应坐标。
Iridium-Catalyzed Reactions of Trifluoromethylated Compounds with Alkenes: A Csp<sup>3</sup>H Bond Activation α to the Trifluoromethyl Group
Catalytic convenience: The use of iridium or ruthenium catalysts for CHbondactivation has led to the addition reaction of trifluoromethylated compounds to alkenes (see scheme). This atom‐economical reaction occurs under neutral reaction conditions and without the formation of undesired defluorinated by‐products, even at high temperature.