Allenyl allylic ethers: synthesis and thermal rearrangements
摘要:
Application of the sequence halogenation/dehydrohalogenation/isomerization to alkenes 1a-g affords allenyl allylic ethers 5a-g. Thermal isomerizations of 5a,d,e proceed by Claisen rearrangement, while 5b,c,f,g are transformed by alternate modes of [2 + 2]cycloaddition involving biradical intermediates of type 19 to polycyclic structures; the variations in these thermal isomerizations are mainly a function of ring size.
Allenyl allylic ethers: synthesis and thermal rearrangements
摘要:
Application of the sequence halogenation/dehydrohalogenation/isomerization to alkenes 1a-g affords allenyl allylic ethers 5a-g. Thermal isomerizations of 5a,d,e proceed by Claisen rearrangement, while 5b,c,f,g are transformed by alternate modes of [2 + 2]cycloaddition involving biradical intermediates of type 19 to polycyclic structures; the variations in these thermal isomerizations are mainly a function of ring size.
regio- and stereoselective halofluorination with pyridiniumpoly(hydrogenfluoride) and 1,3-dibromo-5,5-dimethylhydantoion or N-iodosuccinimide to give (1S*,2S*,3S*)-1-alkoxy-3-fluoro-2-halocycloalkanes in good yields. Among the halofluorides, the 3-(2-propynyloxy) derivatives are in turn converted into bicyclic α-methylene-γ-butyrolactons containing a fluorine via radical cyclization followed by oxidation
3-烷氧基环烯烃与吡啶鎓聚(氟化氢)和1,3-二溴-5,5-二甲基乙内酰脲或N-碘代琥珀酰亚胺进行区域和立体选择性卤代氟化反应,得到(1 S *,2 S *,3 S *)-1-烷氧基-3-氟-2-卤代环烷烃收率高。在卤代氟化物中,3-(2-丙炔氧基)衍生物通过自由基环化反应继而被氧化成含氟的双环α-亚甲基-γ-丁内酯,然后氧化,导致立体立体合成(±)-4-氟- l- Epi- damsin。
Allenyl allylic ethers: synthesis and thermal rearrangements
作者:Jean Pierre Dulcere、Jack Crandall、Robert Faure、Maurice Santelli、Valerie Agati、Mohamed N. Mihoubi
DOI:10.1021/jo00073a032
日期:1993.10
Application of the sequence halogenation/dehydrohalogenation/isomerization to alkenes 1a-g affords allenyl allylic ethers 5a-g. Thermal isomerizations of 5a,d,e proceed by Claisen rearrangement, while 5b,c,f,g are transformed by alternate modes of [2 + 2]cycloaddition involving biradical intermediates of type 19 to polycyclic structures; the variations in these thermal isomerizations are mainly a function of ring size.