2-Aryl-2-nitroacetates as Central Precursors to Aryl Nitromethanes, α-Ketoesters, and α-Amino Acids
摘要:
Nitroarylacetates are useful small molecular building blocks that act as precursors to alpha-ketoesters and aryl nitromethanes as well as alpha-amino acids. Methods were developed that produce each of these compound types in good yields. Two different conditions for decarboxylation are discussed for substrates with neutral and electron-poor aryl groups versus electron-rich aryl groups. For formation of the alpha-ketoesters, new mild conditions for the Nef disproportionation were identified.
In Situ Generated Ag<sup>II</sup>-Catalyzed Selective Oxo-Esterification of Alkyne with Alcohol to α-Ketoester: Photophysical Study
作者:Radha M. Laha、Saikat Khamarui、Saikat K. Manna、Dilip K. Maiti
DOI:10.1021/acs.orglett.5b03484
日期:2016.1.4
An expert and easy one-step catalytic method for the multi O-C coupling of alkyne is developed for the synthesis of valuable alpha-ketoesters and their chiral analogues, in contrast to the generation of esters by a noncatalytic method. The in situ generated powerful Ag-II catalyst from AgOTf is the workhorse in the oxidative grafting of alkyne with PhIO and alcohol. The radical mechanism is confirmed in our controlled experiments and UV-vis study.