Unexpected Results in the Reduction of Tetracyclic Enamides. Structure, Stereochemistry and Conformation of a 20b-Hydroperoxyimine
摘要:
Reduction of N(b)-allyl-20-ethyltetracyclic enamide (7) with lithium aluminium hydride afforded the expected enamine (12) and 4a-oxoethylhexahydrocarbazolones (18a,b). Reduction of N(b)-unsubstituted enamide (6), under the same conditions, gave imine (9), enamine (11) and a 20beta-hydroperoxytetracyclic imine (19) resulting from the peroxydation of 9 and 11. The C-20 stereochemistry of 19 was established by means of 2D H-1 nmr and NOE difference spectroscopy.
Unexpected Results in the Reduction of Tetracyclic Enamides. Structure, Stereochemistry and Conformation of a 20b-Hydroperoxyimine
摘要:
Reduction of N(b)-allyl-20-ethyltetracyclic enamide (7) with lithium aluminium hydride afforded the expected enamine (12) and 4a-oxoethylhexahydrocarbazolones (18a,b). Reduction of N(b)-unsubstituted enamide (6), under the same conditions, gave imine (9), enamine (11) and a 20beta-hydroperoxytetracyclic imine (19) resulting from the peroxydation of 9 and 11. The C-20 stereochemistry of 19 was established by means of 2D H-1 nmr and NOE difference spectroscopy.
Unexpected Results in the Reduction of Tetracyclic Enamides. Structure, Stereochemistry and Conformation of a 20b-Hydroperoxyimine
作者:Denis Dugat、G屍ard Dauphin、Jean-Claude Gramain
DOI:10.3987/com-94-6767
日期:——
Reduction of N(b)-allyl-20-ethyltetracyclic enamide (7) with lithium aluminium hydride afforded the expected enamine (12) and 4a-oxoethylhexahydrocarbazolones (18a,b). Reduction of N(b)-unsubstituted enamide (6), under the same conditions, gave imine (9), enamine (11) and a 20beta-hydroperoxytetracyclic imine (19) resulting from the peroxydation of 9 and 11. The C-20 stereochemistry of 19 was established by means of 2D H-1 nmr and NOE difference spectroscopy.