Butenolide Synthesis from Functionalized Cyclopropenones
作者:Sean S. Nguyen、Andrew J. Ferreira、Zane G. Long、Tyler K. Heiss、Robert S. Dorn、R. David Row、Jennifer A. Prescher
DOI:10.1021/acs.orglett.9b03298
日期:2019.11.1
A general method to synthesize substituted butenolides from hydroxymethylcyclopropenones is reported. Functionalized cyclopropenones undergo ring-opening reactions with catalytic amounts of phosphine, forming reactive ketene ylides. These intermediates can be trapped by pendant hydroxy groups to afford target butenolide scaffolds. The reaction proceeds efficiently in diverse solvents and with low catalyst
A simple and efficient method for mild and selective oxidation of propargylic alcohols using TEMPO and calcium hypochlorite
作者:Sabbasani Rajasekhara Reddy、Anju Chadha
DOI:10.1039/c3ra41721b
日期:——
Oxidation of propargylic alcohols to the corresponding aldehydes and ketones was achieved at room temperature using 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) and calcium hypochlorite (Ca(OCl)2). Propargylic diols yielded corresponding dialdehydes as the product. This system was found to be very efficient for both the electron donating and electron withdrawing groups such as methoxy and nitro substituted