|
1
|
Kaneko M, Yamashita A, Yasuno Y, Yamauchi K, Sakai K, Oishi T. Synthesis of the MN Ring of Caribbean Ciguatoxin C-CTX-1 via Desymmetrization by Acetal Formation. Org Lett 2024; 26:855-859. [PMID: 38241474 DOI: 10.1021/acs.orglett.3c04013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2024]
Abstract
The MN ring of Caribbean ciguatoxin C-CTX-1 was synthesized from a meso-syn-2,7-dimethyloxepane derivative corresponding to the M ring via desymmetrization by acetal formation with a camphor derivative, followed by construction of the N ring via the Horner-Wadsworth-Emmons reaction and acetal formation. The meso-syn-2,7-dimethyloxepane derivative was synthesized via photoinduced electrocyclization of a conjugated exo-diene under flow conditions, giving a cyclobutene derivative, followed by ring expansion via oxidative cleavage and diastereoselective reduction of a β-hydroxy ketone.
Collapse
Affiliation(s)
- Masahiro Kaneko
- Department of Chemistry, Faculty and Graduate School of Science, Kyushu University, 744 Moooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Atsuhiro Yamashita
- Department of Chemistry, Faculty and Graduate School of Science, Kyushu University, 744 Moooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Yoko Yasuno
- Department of Chemistry, Faculty and Graduate School of Science, Kyushu University, 744 Moooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Kosei Yamauchi
- Department of Chemistry, Faculty and Graduate School of Science, Kyushu University, 744 Moooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Ken Sakai
- Department of Chemistry, Faculty and Graduate School of Science, Kyushu University, 744 Moooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Tohru Oishi
- Department of Chemistry, Faculty and Graduate School of Science, Kyushu University, 744 Moooka, Nishi-ku, Fukuoka 819-0395, Japan
| |
Collapse
|