Treatment of the bridged methyl furanosides 1, 3 and 5 with dilute acid furnishes the corresponding deoxyfuranose derivatives 2, 4 and 6. The trans-substitution pattern of the tetrahydrofuran ring was established by X-ray structural analysis of 2 and by comparison of the 1 H-NMR spectra. A new reso-
Optically active triarylboranes: synthesis and stereoisomerization of ethano-bridged triarylboranes
β Scribed by Keiji Okada; Haruki Inokawa; Masaji Oda
- Publisher
- Elsevier Science
- Year
- 1991
- Tongue
- French
- Weight
- 234 KB
- Volume
- 32
- Category
- Article
- ISSN
- 0040-4039
No coin nor oath required. For personal study only.
π SIMILAR VOLUMES
## Abstract Irradiation of the dihydrooxepine monoester (+)β4 gives the bridged bicyclobutane (+)β5 in 77% yield. On the other hand, the corresponding diester 1 yields the cyclobutene 2. Possible explanations for this differing behaviour are discussed.
## Abstract The resolution of the earlier reported racemic bridged methyl deoxyfuranosides 1 and 3 was achieved via fractional crystallization of the ephedrinium salts 2 or by column chromatography of the camphanoates 5. The absolute configurations of 1 and 3 were established by Xβray structural an