Hetero-cope-umlagerungen -II. Einfache und flexible synthesen für 2-substituierte indole
作者:Siegfried Blechert
DOI:10.1016/s0040-4039(01)90006-1
日期:1984.1
The reaction of N-phenylhydroxylamine derivatives with electron withdrawing allenes gives o-alkylated anilines, which can further react to form 1,2-disubstituted indoles. 2-Substituted indoles are directly obtainable from reaction with N-phenyl-nitrones.
reactivity of allenic trichloromethyl sulfoxides under ultrasound irradiation has been investigated. A considerable rate enhancement has been observed for cycloaddition of the unsubstituted and γ-monosubstituted allenyl trichloromethyl sulfoxides to cyclopentadiene. With the corresponding γ,γ-disubstituted allenic sulfoxides, a competing 1,2- to 1,3-diene isomerization is observed.
Blechert, Siegfried, Liebigs Annalen der Chemie, 1985, # 4, p. 673 - 682
作者:Blechert, Siegfried
DOI:——
日期:——
Facile, regio and stereoselective Diels-Alder reactions of allenic trichloromethyl sulfones and sulfoxides
作者:Samuel Braverman、Zvi Lior
DOI:10.1016/s0040-4039(00)73478-2
日期:1994.9
The dienophilic reactivity of allenes is drastically increased by the powerful electron withdrawing trichloromethylsulfonyl or sulfinyl substituents. The [4+2]-cycloadditions proceed smoothly with high regio- and stereoselectivity under mild conditions. Using an optically active allenyl sulfone, transfer of chirality has been observed.
Braverman,S.; Stabinsky,Y., Israel Journal of Chemistry, 1967, vol. 5, p. 125 - 126