α-Aminated methyllithium by DTBB-catalysed lithiation of a N-(chloromethyl) carbamate
作者:Javier Ortiz、Albert Guijarro、Miguel Yus
DOI:10.1016/s0040-4020(99)00155-6
日期:1999.4
The reaction of O-tert-butyl-N-(chloromethyl)-N-methyl carbamate (1) with lithium powder and a catalytic amount of 4,4′-di-tert-butylbiphenyl (DTBB, 2.5 mol %) in the presence of different electrophiles [Me3SiCl, iBuCHO, tBuCHO, PhCHO, 4-MeOC6H4CHO, (CH2)4CO, MeCOnPr, Et2CO, MeCO(CH2)2CHCH2, PhCOMe, PhCOnBu, Ph2CO] in THF at −78°C leads, after hydrolysis with water, to the expected functionalised
的反应ö -叔丁基- ñ - - (氯甲基)ñ -甲基氨基甲酸叔丁酯(1与锂粉末和)催化量的4,4'-二-叔在存在-butylbiphenyl(DTBB,2.5摩尔%)不同的亲电子的[我3的SiCl,我BuCHO,吨BuCHO,苯甲醛,4-MeOC 6 H ^ 4 CHO,(CH 2)4 CO,梅科ñ PR等2 CO,梅科(CH 2)2 CHCH 2, PhCOMe,PhCO n Bu,Ph 2在-78°C下的THF中,CO]用水水解后,生成预期的官能化氨基甲酸酯2。衍生自羰基化合物的氨基甲酸酯2用氯化氢(对于芳香族醛或酮衍生物)或与苯酚和三甲基甲硅烷基氯的混合物(对于脂肪族醛衍生物)脱保护,得到取代的1,2-二醇4。