Indirect electrochemical methoxylation of -acyl and -carboalkoxy α-aminoacidesters in α-position to nitrogen is possible, if chloride is used as mediator. The course of the reaction depends upon the protecting group as well as upon the amino acid side-chain. Increased electron withdrawing effects of the protecting group are accelerating the reaction. On the other hand aliphatic side-chains are diminishing
Hydro-De-Phosphoniation of 4-Substituted-4-Triphenylphosphonio-5(4<i>H</i>)-Oxazolones With Alcohols
作者:Roman Mazurkiewicz、Anna W Pierwocha、Anna Brachaczek、Iwona Mitrus
DOI:10.1080/10426500008076324
日期:2000.2
Abstract 4-Substituted-4-triphenylphosphonro-5(4H)-oxazolones with a bulky alkyl substituent at the position 4 treated with MeOH in the presence of DBU (1.8-diazobicyclo[5.4.0]undec-7-ene) at room temperature give corresponding N-acyl-α-amino acid esters. In the case of a smaller substituent at the position 4 (Me, MeOCH2), the triphenylphosphonium group was competitively displaced by the methoxy group