DTBB-Catalysed lithiation of 1,4-dichloro-2-butyne under Barbier conditions: Synthesis of functionalised alkynes
作者:Albert Guijarro、Miguel Yus
DOI:10.1016/0040-4020(94)00936-o
日期:1995.1
The reaction of 1,2-dichloro-2-butyne (1) with an excess of lithium powder and a catalytic amount of 4,4′-di-tert-butylbiphenyl (DTBB, 2.5 mol %) in the presence of an electrophile [Me3SiCl, ButCHO, Me2CO, Et2CO, (CH2)4CO, (CH2)5CO, (CH2)7CO] in THF at −40°C leads, after hydrolysis with water, to the corresponding disubstituted acetylenes 2 in moderate yields.
1,2-二氯-2-丁炔(1)与过量的锂粉末和4,4催化量的反应' -二-叔-butylbiphenyl(DTBB,2.5摩尔%)在亲电的存在[我3的SiCl,卜吨CHO中,Me 2 CO,等2 CO,(CH 2)4 CO,(CH 2)5 CO,(CH 2)7 CO]在THF中在-40°C的引线,用水水解后,以中等收率得到相应的二取代的乙炔2。