First organophosphorus radical-mediated cyclisations to afford medium-sized rings: eight-membered lactones and seven- and eight-membered lactams
作者:Stuart Lang、Michael Corr、Neil Muir、Tanweer A. Khan、Franziska Schönebeck、John A. Murphy、Andrew H. Payne、Andrew C. Williams
DOI:10.1016/j.tetlet.2005.04.032
日期:2005.6
N-ethylpiperidine hypophosphite (EPHP) and diethylphosphine oxide (DEPO) are efficient reagents for carrying out the formation of seven- and eight-memberedrings. Esters and amides were successfully converted into the corresponding eight-membered lactones and seven- and eight-membered lactams in good to excellent yields.