Highly regioselective nucleopalladation for the oxidative coupling of internal alkynes with alkenyl alcohols by using green and low-costing oxygen as the sole oxidant was investigated. This one-pot cascade cyclization proceeds through Pd-catalyzed intramolecular C–O bond cyclization, insertion of nonbiased alkenyl alcohols, β-H elimination, and reinsertion of a HPdX species, which is finally transferred
Cu(OAc)2 catalyzed ultrasound assisted rapid synthesis of isocoumarin derivatives bearing 3-oxobutyl moiety at C-4 position
作者:Sidda Ramarao、Mohanreddy Pothireddy、Rapolu Venkateshwarlu、Krishna Murthy VR. Moturu、Vidavalur Siddaiah、Rambabu Dandela、Manojit Pal
DOI:10.1016/j.molstruc.2022.132418
日期:2022.4
A rapid synthesis of isocoumarins has been achieved via the Cu-catalysed cascade reaction involving tandem intramolecular cyclization followed by olefin addition under ultrasound irradiation. The methodology involved one-pot reaction of 2-alkynylbenzoate esters with methyl vinyl ketone in the presence of Cu(OAc)2 in aqueous DMF to afford a range of isocoumarin derivatives bearing 3-oxobutyl moiety