Synthesis and Further Reactivity of Functionalized Lactam-Derived Enol Triflates
作者:Tim Luker、Henk Hiemstra、W. Nico Speckamp
DOI:10.1021/jo971192s
日期:1997.11.1
Pyrrolidinone- and piperidinone-derivedenoltriflates 2 were prepared in high yield (60-97%) from the corresponding lactams 1 using KHMDS and N-(5-chloro-2-pyridyl)triflimide. A structure-stability study on the less stable pyrrolidinone-derived triflates revealed that an N-tosyl group is essential, and an alpha-ethoxy substituent enhances thermal stability. Substituents at the 3- and 4-position are