Abstract Opticallyactive 4-substituted γ-lactones (3 and 4) were synthesized effectively using lipase-catalyzed opticalresolution. N-methyl-4-hydroxyalkanamides (rac-1a–i) as substrates were prepared from N-methylsuccinimide. The alkylation of N-methylsuccinimide using Grignard reagents generated from various alkyl halides followed by reduction resulted in N-methyl-4-hydroxyalkanamides. The optical resolution
Fe(III)‐Catalyzed Aerobic Oxidation of 1,4‐Diols<sup>†</sup>
作者:Junlin Li、Jinxian Liu、Chunling Fu、Shengming Ma
DOI:10.1002/cjoc.202200768
日期:2023.8.15
Aerobic oxidation has been catching more and more attention because of its atom economy and environmental friendliness. Oxidation of diols is a challenge due to various oxidative products. Thus, highly selective aerobic oxidation affording specific products is of current interest. In this work, a combination of Fe(NO3)3·9H2O/TEMPO/KCl catalysis has been identified as an efficient recipe for the aerobic
gamma- and delta-Lactones 5, 6, 13, 14, 15 and 16 were synthesized via baker's yeast reduction of the corresponding keto acids 3 ,4 and 9-12. The enantioselectivity of the reduction is strongly dependent on the nature of the keto acid: the delta-lactones were always obtained in an ee% higher than the gamma-lactones and ranging from 70% to 100%.
Krief, Alain; Ronvaux, Alain; Tuch, Arounarith, Bulletin des Societes Chimiques Belges, 1997, vol. 106, # 11, p. 699 - 702