Enantioselectivedecarboxylative protonation of tetralone-derived β-ketocarboxylic acids was achieved with up to 89% enantiomeric excess (ee)–in the presence of a chiral primary amine catalyst. Furthermore, this method was applied to enantioselective deuteration to afford the corresponding α-deuterioketones with up to 88% ee.
的四氢萘酮衍生的β酮羧酸的对映选择性脱羧质子化用高达89%对映体过量(ee)实现-在手性伯胺催化剂的存在下进行。此外,将该方法应用于对映选择性氘化,以提供相应的 α-氘代酮,其 ee 高达 88%。
Catalyst-Free Decarboxylative Fluorination of Tertiary β-Keto Carboxylic Acids
Decarboxylativefluorination of tertiary β-keto carboxylic acids was performed using an electrophilic fluorinating reagent. The reaction proceeded in the absence of a catalyst or base to yield the corresponding α-fluoroketones with tertiary fluorocarbons in good to high yields. Considering that the α-fluorination of asymmetrical ketones often causes problems with the regioselectivity between the
were synthesized with high enantiopurity by asymmetric decarboxylative chlorination and subsequent nucleophilicsubstitution. We recently reported the asymmetric decarboxylative chlorination of β-ketocarboxylic acids in the presence of a chiral primary amine catalyst to obtain α-chloroketones with high enantiopurity. Here, we found that nucleophilicsubstitution of the resulting α-chloroketones with tetrabutylammonium
The Enantioselective Intermolecular Saegusa Allylation
作者:Ji Liu、Edward M. Laguna、Arun Raj Kizhakkayil Mangadan、Kyoungmin Kang、Aaron Aponick
DOI:10.1021/acscatal.1c04546
日期:2021.12.17
A simple procedure for the intermolecular enantioselective palladium-catalyzeddecarboxylativeallylation of β-ketoacids is described. This method, inspired by a stoichiometric control experiment performed by Saegusa and co-workers some 40+ years ago, makes use of allyl carbonates as the coupling substrates and enables direct access to α-allylated ketones bearing newly formed quaternary stereocenters
Decarboxylative aldol reaction of aliphatic carboxylic acids is a useful method for C–C bond formation because carboxylic acids are an easily available class of compounds. In this study, we found that the decarboxylative aldol reaction of tertiary β-ketocarboxylic acids and trifluoropyruvates proceeded smoothly to yield the corresponding aldol products in high yields and with high diastereoselectivity