4,4′-di-tert-butylbiphenyl-catalysed lithiation of 2,3-dichloropropene: A Barbier-type practical alternative to 2,3-dilithiopropene
作者:Albert Guijarro、Miguel Yus
DOI:10.1016/s0040-4039(00)91989-0
日期:1993.3
The reaction of 2,3-dichloropropene (1) and different carbonyl compounds (2) with an excess of lithium powder (1:7 molar ratio) in the presence of a catalytic amount of 4,4'-di-tert-butylbiphenyl (5 mol %) in tetrahydrofuran at 0-degrees-C leads, after hydrolysis with aqueous hydrochloric acid, to the corresponding 1,4-diols in a Barbia-type process.
DTBB-catalysed lithiation of 2,3-dichloropropene and related chloroamines: Synthetic applications
作者:Fernando F Huerta、Cecilia Gómez、Albert Guijarro、Miguel Yus
DOI:10.1016/0040-4020(95)00066-h
日期:1995.3
The reaction of 2,3-dichloropropene (1) and different carbonyl compounds (2) with an excess of lithium powder (1:7 molar ratio) in the presence of a catalytic amount of DTBB (5 mol %) in THF at 0°C leads, after hydrolysis with water, to the corresponding methylenic 1,4-diols 3 in a Barbier-type process. The cyclisation of diols 3 under acidic conditions (hydrochloric or phosphoric acid) yields the