The intermediacy of oxycyclobutenes in the synthesis and reactions of cyclobutenones and cyclobutenols
作者:Aryeh A Frimer、Hillel Pizem
DOI:10.1016/s0040-4020(99)00695-x
日期:1999.10
of the isopropyl ylide to cyclobutenone 4; in a normal addition of ketone to ylide, vinylallene 12 is also obtained. Finally, the corresponding Wittig reaction of 4,4-dichlorocyclobutenone 3 yields only the 2,4-dichloro isomer 13. When this reaction is carried in the presence of n-butoxide, dienone 32 is generated.
Vinylcyclobutenol 7,产生经由alkylidenecyclobutene的单氧合5,重排在室温下的异构体二烯酮的溶剂取决于混合物10和11。Alkylidenecyclobutene 5被依次制备经由逆维蒂希加入异丙基叶立德cyclobutenone的4 ; 在将酮通常加到叶立德中时,还得到乙烯基亚丙基12。最后,相应的4,4-二氯环丁烯酮3的Wittig反应仅产生2,4-二氯异构体13。当该反应在n的存在下进行时-丁氧化物生成二烯酮32。