Fe(0)-Mediated Synthesis of Tri- and Tetra-Substituted Olefins from Carbonyls: An Environmentally Friendly Alternative to Cr(II)
作者:J. R. Falck、Romain Bejot、Deb K. Barma、Anish Bandyopadhyay、Suju Joseph、Charles Mioskowski
DOI:10.1021/jo061445u
日期:2006.10.1
carbonyls by activated polyhalides. In many instances, Fe(0) was equivalent or superior to Cr(II). Notably, Fe(0), but not Cr(II), proved compatible with a wide range of functionality, inter alia, unprotected phenol, aryl nitro, carboxylic acid, and alkyl nitrile. A surprising reversal of stereoselectivity for aldehydes versus ketones was observed using both metals. The resultant α-halo-α,β-unsaturated or α
Chemo-and stereoselectivity of the reaction of aromatic aldehydes with triphenylphosphine and trichloroacetic acid derivatives
作者:E. D. Matveeva、A. S. Erin、A. G. Osetrov、I. F. Leshcheva、A. L. Kurts
DOI:10.1134/s1070428006030080
日期:2006.3
Aromatic aldehydes react with triphenylphosphine and ethyl trichloroacetate or trichloroacetonitrile to give the corresponding benzylidene dichlorides or alpha-chlorocinnamic acid derivatives. The chemo- and regioselectivity of these reactions depend on both the substituent in the aromatic ring and reaction conditions. The product configuration was determined on the basis of the coupling constans (2)J(CH) and (3)J(CH) in the C-13 NMR spectra.
Cyanoketenes. Cycloadditions of halocyanoketenes to benzaldehydes
作者:Harold W. Moore、Frank Mercer、Donna Kunert、Pamela Albaugh