Efficient Synthesis of Tetrasubstituted Alkenes by Allylsilane-Terminated Domino-Heck Double Cyclisation
作者:Lutz F. Tietze、Klaus Kahle、Thomas Raschke
DOI:10.1002/1521-3765(20020118)8:2<401::aid-chem401>3.0.co;2-c
日期:2002.1.18
The domino-Heck double cyclisation of the arylbromides 1, which contain an allylsilane and an alkyne moiety and are easily accessible by an addition of the corresponding lithiated alkynes 5 to the aldehydes 4, leads to the tetrasubstituted alkenes 2 and 3 in good yield. The reaction produces exclusively compounds with an E double bond and additionally proceeds with good to excellent induced diastereoselectivity
芳基溴化物1的多米诺-赫克双环化,其包含烯丙基硅烷和炔烃部分,并且容易地通过将相应的锂化炔烃5添加至醛4而容易地获得,从而以良好的收率得到四取代的烯烃2和3。该反应仅产生具有E双键的化合物,并且在1e和1f的情况下,还以良好至优异的诱导的非对映选择性进行。2e的照射导致E和Z化合物以1:1的比例达到稳态平衡。