作者:Hiroshi Ishikawa、Teruaki Mukaiyama、Shigeru Ikeda
DOI:10.1246/bcsj.54.776
日期:1981.3
The reaction of dialkyl acetals derived from α,β-unsaturated aldehydes with Grignard reagents using TiCl4in THF afforded the cross coupling products, allyl ethers, in high yields. The TiCl4-promoted reaction of alkyl 2,4-dichlorophenyl acetals, synthesized from 3,4-dihydro-2H-pyran or ethyl vinyl ether and 2,4-dichlorophenol, with Grignard reagents in THF at low temperature afforded the corresponding
由 α,β-不饱和醛衍生的二烷基缩醛与格氏试剂在 THF 中使用 TiCl4 反应以高产率提供交叉偶联产物烯丙醚。由 3,4-二氢-2H-吡喃或乙基乙烯基醚和 2,4-二氯苯酚合成的烷基 2,4-二氯苯基缩醛在 TiCl4 促进下与格氏试剂在 THF 中的低温反应得到相应的不对称醚高产量。当由芳香醛或乙烯基醚和 2,4-二氯苯酚合成的烷基 2,4-二氯苯缩醛在室温下,在苯或甲苯中,在没有 TiCl4 的情况下,用格氏试剂处理时,发生了交叉偶联反应,并产生了相应的反应。醚以良好的收率分离。