Lithiated benzyllithiums from chlorobenzyl chlorides by a DTBB-catalysed lithiation
作者:Cecilia Gómez、Fernando F. Huerta、Miguel Yus
DOI:10.1016/s0040-4039(96)02393-3
日期:1997.1
The reaction of 2-, 3- or 4-chlorobenzyl chlorides (1a-c) with an excess of lithium and a catalytic amount of DTBB (7 mol%) in the presence of different electrophiles [PriCHO, ButCHO, Et2CO, (CH2)5CO, PhCOMe, Me3SiCl] in THF at −50°C leads after hydrolysis with water, to the expected dioles or disilylated compounds 2aa-2cf.
DTBB-catalysed lithiation of chlorinated benzylic chlorides, alcohols, thiols or amines
作者:Cecilia Gómez、Fernando F Huerta、Miguel Yus
DOI:10.1016/s0040-4020(97)10402-1
日期:1998.2
presence of different electrophiles [PriCHO, ButCHO, Et2CO, (CH2)5CO, PhCOMe, Me3SiCl] in THF at −50°C followed by hydrolysis with water leads to the corresponding compounds 2. When the same DTBB-catalysedlithiation is applied to several chlorinated benzylic alcohols or mercaptans (4 or 5) it is necessary to deprotonate the starting material with BunLi; treatment of the resulting anions or amine 6 as