Asymmetric Synthesis of Fluorinated Allenes by Rhodium‐Catalyzed Enantioselective Alkylation/Defluorination of Propargyl Difluorides with Alkylzincs
作者:Jia Sheng Ng、Tamio Hayashi
DOI:10.1002/anie.202109290
日期:2021.9.13
The reaction of propargyl difluorides R1CF2C≡CR2 with alkylzincs R3ZnCl giving axially chiral fluorinated allenes R1FC=C=CR2R3 with high enantioselectivity (up to 99 % ee) was found to be catalyzed by a chiral diene/rhodium complex. A key step in the catalytic cycle is selective elimination of one of the enantiotopic fluorides at the β-position of an alkenyl-Rh intermediate, which is generated by regioselective
发现炔丙基二氟化物 R 1 CF 2 C≡CR 2与烷基锌 R 3 ZnCl 的反应得到具有高对映选择性(高达 99 % ee)的轴向手性氟化丙二烯 R 1 FC=C=CR 2 R 3手性二烯/铑配合物。催化循环中的一个关键步骤是选择性消除烯基-Rh 中间体 β 位的一种对映氟化物,它是通过将 R 3 -Rh区域选择性加成到起始二氟化物的三键上而产生的。
Plasminogen Activator Inhibitor-1 Inhibitor
申请人:Miyata Toshio
公开号:US20120022080A1
公开(公告)日:2012-01-26
The present invention provides a novel compound having plasminogen activator inhibitor-1 inhibitory activity, and an inhibitor of PAI-1 comprising the compound as an active ingredient. The present invention also provides a pharmaceutical composition having an inhibitory action on PAI-1 activity and being efficacious in the prevention and treatment of various diseases whose onset is associated with PAI-1 activity.
Direct and Chemoselective Synthesis of Tertiary Difluoroketones via Weinreb Amide Homologation with a CHF<sub>2</sub>-Carbene Equivalent
作者:Margherita Miele、Andrea Citarella、Nicola Micale、Wolfgang Holzer、Vittorio Pace
DOI:10.1021/acs.orglett.9b03024
日期:2019.10.18
Weinreb amides into difluoromethylketones with a formal nucleophilic CHF2 transfer agent is reported. Activating TMSCHF2 with potassium tert-amylate enables a convenient access to the difluorinated homologation reagent, which adds to the acylating partners. The high chemoselectivity showcased in the presence of variously multifunctionalized Weinreb amides, jointly with uniformly high yields, enables the
An efficient, chemoselective homologation of Weinreb amides to the corresponding variously substituted [small alpha]-oxyketones has been developed via the addition of lithiated [small alpha]-oxygenated species. This one-step, experimentally easy, high yielding protocol...
Barbier Continuous Flow Preparation and Reactions of Carbamoyllithiums for Nucleophilic Amidation
作者:Maximilian A. Ganiek、Matthias R. Becker、Guillaume Berionni、Hendrik Zipse、Paul Knochel
DOI:10.1002/chem.201702593
日期:2017.8
An ambient temperature continuous flow method for nucleophilic amidation and thioamidation is described. Deprotonation of formamides by lithium diisopropylamine (LDA) affords carbamoyllithium intermediates that are quenched in situ with various electrophiles such as ketones, allyl bromides, Weinreb and morpholino amides. The nature of the reactive lithium intermediates and the thermodynamics of the