systematically subjected to chemical transformations, namely, N-tosylation followed by nucleophilic substitution. The amide function was converted to the corresponding carboxylic acid, esters, amides, aldehyde, and ketone upon treatment with hydroxide, alkoxide, amine, diisobutylaluminium hydride and Grignardreagent, respectively. In these transformations, N-methyl-N-tosylcarboxamides behave like a Weinreb
A new strategy to synthesize 3-acyl-isoxazoles from easily available β,γ-unsaturatedketones in a one-pot reaction was developed, and differently substituted 3-acyl-isoxazoles were obtained via radical 5-endo trig cyclization. The scope of substrates was rather broad.
Effect of Aqueous Polyethylene Glycol on 1,3-Dipolar Cycloaddition of Benzoylnitromethane/Ethyl 2-Nitroacetate with Dipolarophiles: Green Synthesis of Isoxazoles and Isoxazolines
作者:R. Gangadhara Chary、G. Rajeshwar Reddy、Y. S. S. Ganesh、K. Vara Prasad、Akula Raghunadh、T. Krishna、Soumita Mukherjee、Manojit Pal
DOI:10.1002/adsc.201300712
日期:2014.1.13
A 1:1 mixture of water‐polyethyleneglycol (PEG) facilitated the 1,3‐dipolar cycloaddition of benzoylnitromethane/ethyl 2‐nitroacetate with terminal alkynes or alkenes leading to isoxazoles or isoxazolines under green conditions. The methodology is free from the use of any base, catalyst, dehydrating agent or hazardous solvent.