Zinc-catalyzed chemoselective alkylation of α-keto amides with 2-alkylazaarenes
作者:Alagesan Muthukumar、Govindasamy Sekar
DOI:10.1039/c6ob02432g
日期:——
addition of 2-alkylazaarenes to α-keto amides to furnish azaarene incorporated α-hydroxy amides has been developed with a wide range of substrates in moderate to excellent yields, respectively. Chemoselectivealkylation of the keto functionality of the α-keto amides in the presence of simple ketones is the key advantage of this Zn-catalyzed transformation. This approach has been demonstrated to one gram-scale
已经开发了一种锌催化的C-(sp 3)-H将2-烷基氮杂芳烃添加到α-酮基酰胺中以提供掺入氮杂芳烃的α-羟基酰胺的方法,该方法分别在中等到极好的收率下使用了多种底物。在简单的酮存在下,α-酮酰胺的酮官能团的化学选择性烷基化是这种锌催化转化的关键优势。这种方法已被证明可以进行一克规模的合成。1 H NMR和D 2 O交换实验研究表明该反应通过Zn-烯酰胺中间体进行。
Ligand‐Free and Reusable Palladium Nanoparticles‐Catalyzed Alkylation of 2‐Alkylazaarenes with Activated Ketones under Neutral Conditions
activated carbonyl compounds such as α‐keto amide, isatin, 1,2‐diketone, α‐keto ester, trifluoromethyl ketone, and phenylglyoxal derivatives were examined and most of the compounds underwent the reaction smoothly to provide the corresponding products in moderate to excellent yields. Moreover, chemoselective reactions of α‐keto amides in the presence of simple ketones were achieved. Also, the model reaction
A chemoselective reduction of α‐keto amides to biologically important α‐hydroxy amides (mandelamides) by polymethylhydrosiloxane (PMHS) using 5 mol% potassium phosphate (K3PO4) as catalyst has been developed. This transition metal‐free protocol discloses excellent chemoselectivity for the ketone reduction of α‐keto amides in the presence of other reducible functionalities like ketone, nitro, halides
已开发出使用5 mol%磷酸钾(K 3 PO 4)作为催化剂,通过聚甲基氢硅氧烷(PMHS)将α-酮酰胺化学选择性还原为生物学上重要的α-羟基酰胺(扁桃酰胺)的方法。该无过渡金属方案公开了在存在其他可还原官能团(例如酮,硝基,卤化物,腈和酰胺)的情况下,α-酮酰胺的酮还原反应具有出色的化学选择性。此外,化学选择性还原的α-羟基酰胺已被衍生为无异氰酸酯的Passerini加合物。所述Ñ烷基-α羟基酰胺已经通过用甲磺酰cholride和三乙胺处理被成功地转化为3- phenyloxindole衍生物。
Chemoselective reduction of α-keto amides using nickel catalysts
作者:N. Chary Mamillapalli、Govidasamy Sekar
DOI:10.1039/c4cc02744b
日期:——
Ni-catalysts are used for the first time to synthesize α-hydroxy amides and β-amino alcohols from α-keto amides by chemoselective and complete reduction using hydrosilanes.
Ni催化剂首次被用于通过选择性和完全还原使用硅氢化合物从α-酮酰胺合成α-羟基酰胺和β-氨基醇。
Chemo- and Enantioselective Reduction of α-Keto Amides to α-Hydroxy Amides using Reusable CuO-Nanoparticles as Catalyst
作者:Gollapalli Narasimha Rao、Govindasamy Sekar
DOI:10.1021/acs.joc.3c00090
日期:2023.3.17
(CuO-NPs) and (R)-(−)-DTBM SEGPHOS catalyzed chemo- and enantioselectivereduction of α-keto amides to α-hydroxy amides has been developed. The scope of the reaction has been studied with various α-keto amides containing electron-donating and electron-withdrawing groups affording the enantiomerically enriched α-hydroxy amides in good yields with excellent enantioselectivity. The CuO-NPs catalyst has been