Bhide, Bhaskar H.; Brambhatt, Dinker I.; Shah, Kashmira K., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1981, vol. 20, # 9, p. 831 - 832
An investigation into the regioselectivity of the acid catalysed Claisen rearrangement of methyl 4- and 5-allyloxy-2-hydroxybenzoate and derivatives
作者:Laurence M. Harwood
DOI:10.1039/c39830000530
日期:——
The observed products from the acidcatalysedClaisenrearrangement of the methyl esters (1c–g) indicate that, unlike the thermal reaction, regiochemical control is independent of internal hydrogen bonding.
METHOD FOR THE SYNTHESIS OF 4-BENZOFURAN-CARBOXYLIC ACID
申请人:Burgos Alain
公开号:US20090131688A1
公开(公告)日:2009-05-21
The invention concerns a novel method for synthesis of 4-benzofuran-carboxylic acid or alkyl ester thereof.
This method is characterized in that a reaction for aromatization of a compound of formula (II) is performed for the synthesis of the compound of formula (I), according to the scheme A2 below:
wherein R independently represents hydrogen or a linear or branched C
1
-
15
alkyl group.
With the invention, it is possible to industrially synthesize 4-benzofuran-carboxylic acid or alkyl ester thereof with good yield and very good purity.