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-methylcarbamate (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
Deprotonation of α-amido sulfones 7 with BunLi at -90°C followed by reaction with electrophiles leads, depending on the substitution on the amidic nitrogen to enamides 10 (secondary amides 7a,b) or functionalised α-amido sulfones 12 (tertiary amides 7c,d).
O-tert-Butyl-N-(chloromethyl)-N-methyl carbamate as a source of the MeNHCH2− synthon
作者:Albert Guijarro、Javier Ortiz、Miguel Yus
DOI:10.1016/0040-4039(96)01134-3
日期:1996.7
The reaction of O-tert-butyl-N-(chloromethyl)-N-methylcarbamate (1) with lithium powder and a catalytic amount of DTBB (2.5 mol %) in the presence of different electrophiles [Me3SiCl, BuiCHO, ButCHO, PhCHO, (CH2)4CO, Et2CO, PhCOMe, Ph2CO] in THF at −78°C leads, after hydrolysis with water, to the expected functionalised carbamates 2. As an example, the hydrolysis of compound 2e with hydrogen chloride