Reaction of allyl iminophosphoranes with ketenes and acyl chlorides: one-pot preparation of 4-pentenenitriles
摘要:
One-pot conversion of allyl azides into 4-pentenenitriles 4 is achieved by sequential treatment of allyl azides with triphenylphosphine and the corresponding ketene under mild and neutral conditions. On the other hand, allyl iminophosphoranes and related react with arylacetic acid chlorides to give unexpectedly the phosphonium salts 5 which by treatment with base and then heating lead to 4-pentenenitriles 9.
Efficient Synthesis of Enynecarbamates and Their Ring-Closing Metathesis/[4 + 2] Diels−Alder Cycloaddition: Synthesis of Hexahydroisoquinolines
作者:Alan R. Katritzky、Satheesh K. Nair、Tatyana Khokhlova、Novruz G. Akhmedov
DOI:10.1021/jo0340408
日期:2003.7.1
Enynes 5a-g were prepared in moderate to good yields from 1-(triphenylphosphoranylideneaminoalkyl)benzotriazoles. Ring-closingmetathesis of 5a-f afforded functionalizeddienes 6a-f, respectively, which were used in a Diels-Alder cycloaddition reaction in the synthesis of the corresponding hexahydroisoquinoline derivatives 7a-f.