Abstract
An oxetane ring can be constructed from 5α-acyloxy-Δ(4(20))-taxoids. The facile intramolecular acyl migration from 5- to 20-position under slightly basic conditions enabled the construction of the oxetane ring in a convenient short cut, whereas the acyl migration from 2- to 20-position left the 2-hydroxyl accessible to a later benzoylation. An unexpected five-membered 4-O, 20-O sulfite ring was formed in the attempted construction of the oxetane ring with 5α-triflate as a leaving group. After the construction of the oxetane ring, treatment with strong base LiHMDS and acetyl chloride gave the expected 4-O-acetate while treatment with acetic anhydride and DMAP gave a 4-O-acetoacetate.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 236-246 |
| Number of pages | 11 |
| Journal | Chinese Journal of Chemistry |
| Volume | 18 |
| Issue number | 2 |
| State | Published - 2000 |
| Externally published | Yes |
Keywords
- 20-O-sulfite ring
- Five-membered 4-O
- Intramolecular acyl migration
- Oxetane ring
- Taxoids
- Unusual acylation
ASJC Scopus subject areas
- Chemistry(all)