Modified Vilsmeier reactions of activated benzofurans with indolines: Synthesis of benzofuran-fused benzocarbazoles
作者:David St.C. Black、Robert Rezaie
DOI:10.1016/s0040-4039(99)00699-1
日期:1999.5
Regioselective reactions of 3-substituted 4,6-dimethoxybenzofurans with indolin-2-ones and triflic anhydride afforded 7- and/or 2-substituted indolo-benzofurans and the latter were cyclised to previously unknown benzofuran-fused benzocarbazoles using palladium (II) acetate in heated acetic acid.
Preparation of activated benzofurans and their reactions with aldehydes
作者:David St.C. Black、Donald C. Craig、Naresh Kumar、Robert Rezie
DOI:10.1016/s0040-4020(99)00152-0
日期:1999.4
Reactions of 3-substituted 4,6-dimethoxybenzofurans with formaldehyde and aryl aldeydes in the presence of acetic acid and phosphoryl chloride respectively give new macrocyclic calix[3]benzofurans, predominantly with an unsymmetrical linkage pattern. Incorporation of a t-butyl substituent at the 3-position, however, leads to the formation of only a trimer with a symmetrical linkage pattern.
Acid-catalysed reactions of activated benzofuranylmethanols: formation of calixbenzofurans
作者:David StC Black、Donald C Craig、Naresh Kumar、Robert Rezaie
DOI:10.1016/s0040-4020(02)00472-6
日期:2002.6
7-substituted products. Acid-catalysedreactions of 2-hydroxymethylbenzofurans give mainly unsymmetrically linked calix[3]benzofurans. However, acid treatment of 7-hydroxymethylbenzofurans affords only the symmetrically linked calix[3]benzofurans in high yields. Benzofuranyl glyoxylamides, glyoxylates and ketones can be obtained in high yields and the acid-catalysedreactions of their corresponding