Rhodium-catalyzed cyclopropanations of 2-aryl-2H-chromenes with dialkyl malonate esters. A comparison of α-diazo derivatives and phenyliodonium ylides

Sean Stokes, Rachel Mustain, Lydia Pickle, Keith T. Mead

Tetrahedron Letters

Volume 53, Issue 30, 25 July 2012, Pages 3890–3893

http://dx.doi.org/10.1016/j.tetlet.2012.05.061