Ls. Liebeskind et al., PREPARATION OF 3-ACYL-3-CYCLOBUTENE-1,2-DIONES AND SOME RELATED MONOACETALS, Journal of organic chemistry, 58(13), 1993, pp. 3543-3549
3-(Tri-n-butylstannyl)-3-cyclobutene-1,2-diones and hyl-3-(tri-n-butyl
stannyl)-3-cyclobutene-1,2-dione 2-ethylene acetal participate in pall
adium/copper-cocatalyzed cross-coupling with acyl halides and in palla
dium-catalyzed carbonylative cross-coupling with aryl/heteroaryl iodid
es. The derived 3-acyl-3-cyclobutenediones and cyclobutenedione monoac
etals should extend the potential of cyclobutenedione-based synthetic
organic methodology.