The lipase-catalyzed kinetic resolution of a series of aromatic β-hydroxyesters in organic media has been investigated. Decanoic acid and its esters were successfully used as acyl donors for selective O-acylation. The regio- and enantioselective enzymatic hydrolysis of the decanoate moiety of the diesters was also investigated. The effects of water, reaction temperature, and solvent type, and also
Nickel-catalyzed cross-coupling of unactivated alkyl halides and tosylate carrying a functional group with alkyl and phenyl Grignard reagents
作者:Surya Prakash Singh、Jun Terao、Nobuaki Kambe
DOI:10.1016/j.tetlet.2009.07.094
日期:2009.10
primary and secondaryalkylGrignardreagents undergo cross-coupling with alkyl bromides, iodide, and tosylate carrying a functional group such as amide, ester, and ketone at 0 °C in THF. The present procedure provides a simple, convenient, and practical method for construction of carbon chains in the presence of various functional groups. PhMgBr also gave the corresponding coupling product in a moderate
One step conversion of acetals and aldehydes to esters was achieved with hydrogen peroxide (35wt% solution in water) and hydrochloric acid in alcohol. This procedure was proved to be simple and effective.
Methylenation of ester carbonyl group with bis(iodozincio)methane was examined: a use of TiCl2 and amine as mediators facilitated the reaction to give vinyl ethers in good yields.