DTBB-Catalysed dilithiation of styrene and its methyl-derivatives: introduction of two electrophilic reagents
作者:Miguel Yus、Pedro Martı́nez、David Guijarro
DOI:10.1016/s0040-4020(01)01063-8
日期:2001.12
Pr2CO], in THF, at temperatures ranging from −78 to 0°C, gave, after hydrolysis, products 2 resulting from addition of lithium to the olefinic double bond and successive trapping with the electrophilic reagent. When a carbonyl compound was used as electrophile, mixtures of the monoaddition–reduction compounds 3 and 4 were obtained as by-products, which could be easily separated from the diaddition
苯乙烯和一些甲基取代的苯乙烯1与锂和催化量的4,4'-二叔丁基联苯(DTBB)在几种亲电试剂[Me 3 SiCl,Me 2 CO,Et 2 CO, (CH 2)5 CO,Pr 2 CO]在THF中,于-78至0°C的温度范围内,水解后得到由锂加成至烯烃双键并随后用亲电子试剂捕获而得到的产物2。当羰基化合物用作亲电试剂时,单加成还原化合物3和4的混合物获得的副产物可以容易地与二价产物2分离。