Organocatalytic asymmetric synthesis of
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Shaheen M. Sarkar; Yuko Taira; Ayako Nakano; Keisuske Takahashi; Jun Ishihara; S
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Article
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2011
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Elsevier Science
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French
⚖ 513 KB
Quinine and quinidine were synthesized by a highly enantio-and stereoselective approach starting from a proline-catalyzed asymmetric cycloaldolization of benzyl bis(2-formylethyl)carbamate which gave a 70:30 mixture of (3R,4R)-N-Cbz-3-hydroxymethyl-4-hydroxypiperidine (96% ee) and its 4S-epimer (92%