SYNTHESIS OF FLUORO HEMIACETALS VIA TRANSITION METAL-CATALYZED FLUORO ESTER AND CARBOXAMIDE HYDROGENATION
申请人:Triad National Security, LLC
公开号:US20200308089A1
公开(公告)日:2020-10-01
This application is directed to use of transition metal-ligand complexes to hydrogenate fluorinated esters and carboxamides into fluorinated hemiacetals. Methods for synthesis of certain ligands are also provided.
这项应用涉及使用过渡金属配体络合物将氟化酯和羧酰胺加氢成氟代半缩醛。还提供了合成某些配体的方法。
Practical Selective Hydrogenation of α-Fluorinated Esters with Bifunctional Pincer-Type Ruthenium(II) Catalysts Leading to Fluorinated Alcohols or Fluoral Hemiacetals
作者:Takashi Otsuka、Akihiro Ishii、Pavel A. Dub、Takao Ikariya
DOI:10.1021/ja403852e
日期:2013.7.3
Selective hydrogenation of fluorinatedesters with pincer-type bifunctional catalysts RuHCl(CO)(dpa) 1a, trans-RuH2(CO)(dpa) 1b, and trans-RuCl2(CO)(dpa) 1c under mild conditions proceeds rapidly to give the corresponding fluorinatedalcohols or hemiacetals in good to excellent yields. Under the optimized conditions, the hydrogenation of chiral (R)-2-fluoropropionate proceeds smoothly to give the corresponding
Asymmetric Organocatalyzed Friedel–Crafts Reaction of Trihaloacetaldehydes and Phenols
作者:David Svestka、Jan Otevrel、Pavel Bobal
DOI:10.1002/adsc.202200180
日期:2022.7.5
Herein we report the asymmetric organocatalyzed method for the Friedel–Craftsreaction between activatedphenols and trihaloacetaldehydes. A three-phase screening including 41 compounds was employed to identify a catalyst structure based on 3,5-dinitrobenzamide of 9-amino-epi-cinchonidine as the lead catalytic molecule. Under the optimized reaction conditions, the above catalyst offered trihalohydroxyalkylated
Engineering Catalysts for Selective Ester Hydrogenation
作者:Pavel A. Dub、Rami J. Batrice、John C. Gordon、Brian L. Scott、Yury Minko、Jurgen G. Schmidt、Robert F. Williams
DOI:10.1021/acs.oprd.9b00559
日期:2020.3.20
of fluoral hemiacetals under kinetically controlled conditions. Based on experimentalobservations and computational analysis, this paper further extends the current state-of-the-art understanding of the accelerative role of KO-t-C4H9 in ester hydrogenation. It attempts to explain why a maximum turnover is seen to occur starting at ∼25 mol % base, in contrast to only ∼10 mol % with ketones as substrates
当前需要开发有效的催化剂和用于合成官能化的(烯烃和/或手性的)伯醇和氟代半缩醛的方法。这些是制药,农用化学品,香水等的有价值的构建基块。从经济角度看,板凳稳定的高砂国际机场。Corp.的Ru-PNP(通常称为Ru-MACHO)和Gusev的Ru-SNS络合物可以说是最吸引人的从酯和H 2中获取伯醇的分子催化剂(Waser,M.et al.Org.Proc。 RES。开发。2018,22, 862)。这项工作介绍了具有经济竞争力的Ru-SNP(O)z络合物(z= 0,1),它们结合了这两种催化剂的关键结构要素。特别地,发现将SNP杂原子结合到配体骨架中对于在动力学控制条件下合成氟半缩醛中设计更具产物选择性的催化剂至关重要。基于实验观察和计算分析,本文进一步扩展了对KO- t -C 4 H 9在酯加氢中的促进作用的最新认识。它试图解释为什么从大约25 mol%的碱开始出现最大的转化率,而以酮为底物的情况只有10