Process for functionalising a phenolic compound carrying an electron-donating group
申请人:Mioskowski Charles
公开号:US20070049773A1
公开(公告)日:2007-03-01
The invention concerns a method for functionalizing a phenolic compound bearing an electron-donor group, in said group para position, inter alia a method for the amidoalkylation of a phenolic compound bearing an electron-donor group, and more particularly, a phenolic compound bearing an electron-donor group preferably, in the hydroxyl group ortho position. The method for functionalizing in para position with respect to an electron-donor group carried by a phenolic compound is characterised in that the phenolic compound bearing an electron-donor group is subjected to the following steps: a first step which consists of protecting the hydroxyl group in the form of a sulphonic ester function; a second step which consists in reacting the protected phenolic compound with an electrophilic reagent; optionally, a third step deprotecting the hydroxyl group.
Benzylsulfonyl: a valuable protecting and deactivating group in phenol chemistry
introduce benzylsulfonyl (Bns) as a valuable protectinggroup in phenol chemistry. Bns proved to be stable under drastic reaction conditions and towards many common reagents. The deprotection proceeds quantitatively using catalytic hydrogenolysis. Additionally the Bns deactivating properties make this protectinggroup useful for tuning the reactivity of phenolic substrates.
Mesyl guaiacol: a versatile intermediate for the synthesis of 5-aminomethyl guaiacol and related compounds
作者:Nicolas Bensel、Virginie Pevere、Jean Roger Desmurs、Alain Wagner、Charles Mioskowski
DOI:10.1016/s0040-4039(02)00673-1
日期:2002.6
An original synthetic pathway for the preparation of 5-substituted guaiacol derivatives is described. This method relies on the deactivation of the phenol group by converting it into the corresponding mesyl ester. Amidomethylation reactions lead to regioselective CC bond formation at the 5-position of guaiacol. Thus, 5-aminomethyl-guaiacol was obtained in four steps and 75% overall yield.