Synthesis of conjugated enynes from ketones and aldehydes by 1,2-CC insertion and 1,2-CH insertion of carbenoids as the key reactions
作者:Naoyuki Ishida、Hideki Saitoh、Simpei Sugiyama、Tsuyoshi Satoh
DOI:10.1016/j.tet.2011.02.079
日期:2011.4
On the other hand, the addition reactions of 1-chlorovinyl p-tolyl sulfoxides derived from aldehydes with lithium acetylides directly gave conjugated enynes bearing a p-tolyl sulfinyl group at the 1-position through the 1,2-carbon–hydrogen insertion (1,2-CH insertion) reaction of the generated lithium carbenoid intermediates. These procedures provide a good way for the synthesis of multi-substituted
1-氯乙烯基的加成反应p -甲苯基亚砜,这是从酮和氯甲基衍生的p -甲苯基砜,与锂乙炔化物在中等至良好的产率,得到的加合物。用格氏试剂对加合物进行处理,通过生成的镁类马鞭草中间体的1,2-碳-碳插入(1,2-CC插入)反应,以高至高收率形成了共轭烯炔。另一方面,由醛衍生的1-氯乙烯基对甲苯基亚砜与乙炔化锂的加成反应直接得到带有p的共轭烯炔。通过生成的锂类橡胶中间体的1,2-碳-氢插入(1,2-CH插入)反应在1-位上生成-甲苯基亚磺酰基。这些程序为从酮和醛合成多取代的共轭烯炔提供了一个好方法。