5,5′-Dimethyl-3,3′-azoisoxazole as a new heterogeneous azo reagent for esterification of phenols and selective esterification of benzylic alcohols under Mitsunobu conditions
3′-azoisoxazole is used as a new efficient heterogeneous azo reagent for the highly selective esterification of primary and secondary benzylic alcohols and phenols with aliphatic and aromatic carboxylic acids via Mitsunobu protocols. The reaction is highly selective for primary benzylic alcohols versus secondary ones, aliphatic alcohols and also phenols. The isoxazole hydrazine byproduct can be simply isolated
Magnetic reduced graphene oxide supported CuO (rGO/Fe3O4–CuO) as a heterogeneous catalyst in cross dehydrogenative coupling (CDC) reactions has been demonstrated for the synthesis of esters using methyl aromatics and aldehydes/benzyl alcohols as coupling partners. Various benzylic esters were prepared efficiently from cheap raw chemicals by employing tert-butyl hydroperoxide (TBHP) as a “green” oxidant
Monomer-on-Monomer (MoM) Mitsunobu Reaction: Facile Purification Utilizing Surface-Initiated Sequestration
作者:Pradip K. Maity、Alan Rolfe、Thiwanka B. Samarakoon、Saqib Faisal、Ryan D. Kurtz、Toby R. Long、Alexander Schätz、Daniel L. Flynn、Robert N. Grass、Wendelin J. Stark、Oliver Reiser、Paul R. Hanson
DOI:10.1021/ol1022382
日期:2011.1.7
A monomer-on-monomer (MoM) Mitsunobu reaction utilizing norbornenyl-tagged (Nb-tagged) reagents is reported, whereby purification was rapidly achieved by employing ring-opening metathesis polymerization, which was initiated by any of three methods utilizing Grubbs catalyst: (i) free catalyst in solution, (ii) surface-initiated catalyst-armed silica, or (iii) surface-initiated catalyst-armed Co/C magnetic nanoparticles.