Generation and Reactions of Lithiated<i>tert</i>-Butyl and 2,6-Di(<i>tert</i>-butyl)-4-methylphenyl Cyclopropanecarboxylates
作者:Robert Häner、Thomas Maetzke、Dieter Seebach
DOI:10.1002/hlca.19860690720
日期:1986.10.29
tert-Butyl and 2,6-di(tert-butyl)-4-methylphenyl (BHT) cyclopropanecarboxylates (4, 6, 24, 25) are lithiated with LiN(i-Pr)2 and t-BuLi, respectively. Reactions with alkyl halides, aldehydes, acyl chlorides, and heteroelectrophiles give α-substituted BHT esters which can be cleaved (t-BuOK/H2O/THF) to the corresponding carboxylic acids or reduced (LiAlH4/THF) to the cyclopropanemethanols.
叔丁基和2,6-二(叔丁基)-4-甲基苯基(BHT)环丙烷羧酸酯(4,6,24,25)的与锂化的LiN(I-PR)2和吨分别正丁基锂。与烷基卤化物,醛,酰氯和杂亲电试剂的反应得到α-取代的BHT酯,其可以被裂解(t- BuOK / H 2 O / THF)成相应的羧酸或被还原(LiAlH 4 / THF)成环丙烷甲醇。