Three types of products by carbon nucleophiles toward methoxyphenylacetylenic sulfones
作者:Chia-Yi Cheng、Minoru Isobe
DOI:10.1016/j.tet.2011.09.078
日期:2011.12
Methoxy-arylacetylenic sulfones were examined to react with various carbanion nucleophiles to result in the three types of products; thus, (i) nucleophiles (MeLi·LiBr, Vinyl MgBr, LiCH2CN) showed the α-addition, however, (ii) Li–CC–TMS afforded β-addition (conjugate addition) products. The (iii) displacement reaction through α-addition/isomerization/trans-elimination was enhanced by the presence of ortho-methoxy
检查了甲氧基-芳基乙炔砜与各种碳负离子亲核试剂反应生成三种类型的产物。因此,(i)亲核试剂(MeLi·LiBr,乙烯基MgBr,LiCH 2 CN)显示出α加成,但是,(ii)Li– CC C–TMS提供了β加成(共轭加成)产物。通过在高温下存在邻甲氧基,可以增强通过α-加成/异构化/反式消除的(iii)置换反应。质子溶剂中的杂原子亲核试剂(氮,氧或硫原子)仅提供了所报道的缀合物加成产物。