53938-05-9Relevant articles and documents
122. Syntheses and Chiroptical Properties of the 13-Membered Spermidine Alkaloids (-)-(S)-Celacinnine, (0)-(S)-Celabenzine, (-)-(S)-Celafurine, and (+)-(S)-Viburnine
Kuehne, Paul,Guggisberg, Armin,Hesse, Manfred
, p. 1802 - 1808 (1997)
The title alkaloids were prepared from the common chiral precursor (-)-(2S)-2-phenyl-1,5,9-triazacyclotridecan-4-one (4) which we had synthesized earlier. The spectral data for the spermidine macrocycles are in good agreement with the data reported for the isolated samples. Our experimental results indicate that the originally reported [α]D value of -2.6 (c=0.10, MeOH) for natural (S)-viburnine is erroneous and should be +17.0 (c=0.92, MeOH). As a result of the chiroptical study conducted, it can be shown empirically that all alkaloids of the 'celacinnine' type have the (S)-configuration.
Conjugate addition of 6-membered hydrazine to chiral tert-butyl (E)-2-(p-tolylsulfinyl)cinnamates. Synthesis of (S)-celacinnine
Matsuyama,Itoh,Matsumoto,Ohira,Hara,Yoshida,Iyoda
, p. 2924 - 2930 (2007/10/03)
Two enantiomers of the bicyclic lactam, (S)- and (R)-9-phenyl-1,6-diazabicyclo[4.3.0]nonan-7-one (6), were synthesized stereoselectively with high optical purity (95% ee) by the asymmetric conjugate addition-cyclization of piperidazine to chiral vinyl sulfoxides, tert-butyl (E)-2-[(R)- and (S)-p-tolylsulfinyl]cinnamate (4), followed by removal of the p-tolylsulfinyl group with SmI2. The subsequent reductive cleavage of the N-N bond of the bicyclic lactam 6 with sodium in liquid ammonia produced the corresponding 9-membered azalactam, (S)- and (R)-4-phenyl-1,5-diazacyclononan-2-one (7) with 99% and 97% ee, respectively. X-ray crystallography showed that (S)-7 exists exclusively as a trans conformer in the crystal state. Starting from (S)-7, naturally occurring (S)-celacinnine 1 was synthesized with 99% ee employing the ring-expansion reaction via intramolecular transamidation.
Chiral vinyl sulfoxides as useful reagents for the synthesis of β-amino acid derivatives
Matsuyama, Haruo,Itoh, Nobuhiro,Yoshida, Masato,Iyoda, Masahiko
, p. 475 - 476 (2007/10/03)
(S)- and (R)-β-amino acid derivatives were synthesized by the asymmetric conjugate addition of ammonia and piperidazine to t-butyl (E)-2-[(R)-and (S)-p-tolylsulfinyl]cinnamates, respectively.
ASYMMETRIC SYNTHESIS OF CELACINNINE UTILIZING OPTICALLY ACTIVE VINYL SULFOXIDES
Itoh, Nobuhiro,Matsuyama, Haruo,Yoshida, Masato,Kamigata, Nobumasa,Iyoda, Masahiko
, p. 415 - 418 (2007/10/02)
First asymmetric synthesis of celacinnine (10) was achieved from the nine-membered azalactam, 3-phenyl-4-azaoctanelactam (6), which was synthesized by the addition of piperidazine (4) to optically active vinyl sulfoxides (3).