The gold(I) catalyzed aldol reaction of diethyl a-isocyanomethylphosphonate with benzaldeyde gave the oxazoline 3, a P-hydroxy-a-aminophosphonic acid precursor, with high enantioand diastereoselectivity (98 % tram, 85 % ee) by employing a chiral ferrocenylamine ligand. The use of 31P NMR spectroscop
✦ LIBER ✦
Enantioselective synthesis of the α,α-dimethyl-β-hydroxy : Acid subunit of the oxazolomycin antibiotics
✍ Scribed by Andrew S. Kende; Kuniaki Kawamura; Michael J. Orwat
- Book ID
- 104244595
- Publisher
- Elsevier Science
- Year
- 1989
- Tongue
- French
- Weight
- 330 KB
- Volume
- 30
- Category
- Article
- ISSN
- 0040-4039
No coin nor oath required. For personal study only.
✦ Synopsis
Reaction of the Sn(Il) enolate, generated by the action of SnClz-LiAlH4 on oxazolidinone 5, with benzaldehyde or conjugated Z-enal 8 yields respectively oxaxinedione 6 or 9 with not less than 97 : 3 diastereoselectivity.
Removal of the chiral auxiliary from 9 produces a homochiral model of the CI'CS subunit of the oxarolomycin antibiotics.
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