compound, diethyl acetamidomalonate, can efficiently proceed in the presence of CuI and NaH in DMSO to give diethyl acetamido(aryl)malonates, which may be useful precursors for α-arylglycines, in good yields. Although the reaction with another methine substrate, ethyl 2-cyanopropionate, also affords the expected coupling products, no substitution products are obtained in the case of diethyl methylmalonate
芳基碘化物与活化的次甲基化合物乙酰氨基丙二酸二乙酯的反应可以在 CuI 和 NaH 的 DMSO 中有效进行,得到乙酰氨基(芳基)丙二酸二乙酯,其可能是 α-芳基甘氨酸的有用前体,收率良好。尽管与另一种次甲基底物 2-氰基丙酸乙酯的反应也提供了预期的偶联产物,但在甲基丙二酸二乙酯、芳烃以及正在形成的酯的氧化偶联化合物的情况下没有获得取代产物。
Arylation of Diethyl Acetamidomalonate with Diaryliodonium Salts En Route to α-Arylglycines
作者:Dmitry I. Bugaenko、Olga A. Tikhanova、Valeriy V. Andreychev、Alexander V. Karchava
DOI:10.1021/acs.joc.4c00768
日期:2024.7.19
the synthesis of α-amino acids via C-alkylation under basic conditions followed by hydrolysis/decarboxylation. In contrast, the C-arylation of this reagent remains undeveloped. Herein, we report a novel strategy for the synthesis of racemic α-arylglycines based on the selective arylation of DEAM with diaryliodonium salts under mild, transition metal-free conditions. The reaction features good functional
Tricarbonylchromium complexes 1 react with monosubstituted malonic acid esters 2 in DMSO at room temperature in the presence of KOtBu to give the complexes 3. After oxidative demetalation, the appropriate aryl derivatives 4 are obtained in moderate to good overall yields. Diastereoselective arylations of chirally modified malonates such as 5a-c were studied. The stereoselectivity was highest for the products 6c/6c' (80:20) with (-)-8-phenylmenthol as alcohol component in the malonate 5.