Preparation and remarkable reactivity of the elusive (1,1,3,3-tetramethylallyl)lithium
摘要:
Although traditional methods of allyllithium production failed for (1,1,3,3-tetramethylallyl)lithium, it was readily prepared in a two-pot sequence starting with mesityl oxide. The key step is reductive lithiation of 4-(phenyl-thio)-2, 4-dimethyl-2-pentene with lithium 1-(dimethylamino)naphthalenide. Treating the reductive lithiation Product with trimethylstannyl chloride and the resulting allylstannane with methyllithium in the presence of N,N,N,N-tetramethylethylenediamine provided a solution of the allyllithium free of lithium thiophenoxide. This material adds to anthracene at -78-degrees-C.
Preparation and remarkable reactivity of the elusive (1,1,3,3-tetramethylallyl)lithium
作者:Jose A. Cabral、Theodore Cohen、Wendel W. Doubleday、Ellen Francis Duchelle、Gideon Fraenkel、Bao Shan Guo、Simon H. Yu
DOI:10.1021/jo00039a031
日期:1992.6
Although traditional methods of allyllithium production failed for (1,1,3,3-tetramethylallyl)lithium, it was readily prepared in a two-pot sequence starting with mesityl oxide. The key step is reductive lithiation of 4-(phenyl-thio)-2, 4-dimethyl-2-pentene with lithium 1-(dimethylamino)naphthalenide. Treating the reductive lithiation Product with trimethylstannyl chloride and the resulting allylstannane with methyllithium in the presence of N,N,N,N-tetramethylethylenediamine provided a solution of the allyllithium free of lithium thiophenoxide. This material adds to anthracene at -78-degrees-C.