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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

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✦ 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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Enantioselective synthesis of β-hydroxy-
✍ Antonio Togni; Stephen D. Pastor 📂 Article 📅 1989 🏛 Elsevier Science 🌐 French ⚖ 154 KB

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