14‐14C‐Adriamycin HCI has been prepared from unlabeled adriamycin. The 14C‐Diazald served as the source of the label. This synthesis does not require protection of the phenolic hydroxyl groups.
The synthesis for 8-chloro-(S)- and -(R)-10-[(S)- and -(R)-3'-methylethylaminopyrrolidino]-10,11-dihydrodibenzo[b,f]thiepins is presented. The absolute configuration at position 3' of the aminopyrrolidino side chain is known from synthesis and corresponds to the asymmetric carbon atom in (S)- or (R)-aspartic acid. The absolute configuration at C-10 of the dihydrodibenzo[b,f]thiepin ring system was deduced from ORD-CD analysis coupled with degradation of partially resolved (+)-8-chloro-10-amino-10,11-dihydrodibenzo[b,f]thiepin to (+)-(S)-1,2-diphenylethylamine. The four isomers were studied in mice for their ability to block conditioned avoidance responding, antagonize oxotremorine, and act as analgetics and anticonvulsants. These compounds were found to be nonselective antagonists of histamine, acetylcholine, and BaCl2 in vitro. The compounds exerted effects similar to those of chlorpromazine. Stereoselective differences in activity between diastereoisomers, rather than between enantiomorphs, were generally observed.
The chiral title compounds 2--11 were assessed for their potential anti-Parkinsonian, antipsychotic, and anticonvulsant properties. The most striking differences in the biological activity of enantiomeric pairs were noted for D-(R)-2-amino-N-(3,4-methylenedioxyphenyl)succinimide hydrochloride (2) vs. L-(S)-3 and D-(R)-2-amino-N-(3,4-isopropylidenedioxyphenyl)succinimide (4) vs. L-(S)-5. D-(R)-2-partially attenuated amphetamine-induced stereotyped behavior, whereas D-(R)-4 antagonized oxotremorine-induced tremors. Their respective enantiomorphs were inactive in these tests. No differences in anticonvulsant potency of enantiomeric pairs were observed. The stereoselective actions of D-(R)-2 and 4 were rationalized on the basis of the presence or absence of gem-dimethyl functions in isopropylidenedioxy vs. methylenedioxy groups; the data seem to indicate that these methyl groups influence selective receptor site interaction in the D-(R) series.
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