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- W2952440466 abstract "A number of (E)-7-arylidenenaltrexones were synthesized by azeotropic distillation of water from a benzene solution of naltrexone and an aromatic aldehyde (benzaldehyde, 4-chloro- and 4-fluorobenzaldehyde, 3-and 4-pyridinecarboxaldehyde and 1-methyl-2-imidazolecarboxaldehyde) using piperidine as a catalyst. In addition, (E)-7-benzylidenenaloxone was prepared by the previously published Claisen-Schmidt condensation using sodium hydroxide in methanol. The stereochemistry of these arylidene derivatives 3–9 was determined to be (E) by means of nuclear Overhauser enhancement experiments. The 13C nmr spectra of (E)-3–9 are recorded in deuteriochloroform and those of the hydrochlorides in deuteriodimethyl sulfoxide." @default.
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- W2952440466 date "1996-03-01" @default.
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- W2952440466 title "Synthesis and stereochemical assignment of 7-arylidene and 7-heteroarylidene morphinan-6-ones" @default.
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- W2952440466 doi "https://doi.org/10.1002/jhet.5570330231" @default.
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