Tandem intramolecular wittig and claisen rearrangement reactions in the thermolysis of 2-methyl-2-phenoxy-propionyl-cyanomethylenetriphenylphosphoranes: synthesis of substituted 2H-1-benzopyrans and benzofurans
作者:H. Rehman、Jampani Madhusudana Rao
DOI:10.1016/s0040-4020(01)87711-5
日期:1987.1
The preparation and thermolysis in vacuum of 2-niethyl-2-phenoxypropionyl-cyanomethylenetriphenylphoephoraane and derivatives containing methyl-methoxy- and chloro- substituents in the phenoxy ring is reported. The method merges the preparation of phenyl propargyl ethers by intramolecular Wittig reaction and their Claisen rearrangement into one step. The final products were the corresponding 2H-1-benzopyran