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Preparation of β-(2,2-dimethyltetrahydro-4-pyranyl)-β-oxopropionic acid anilide

✍ Scribed by R. S. Vartanyan; Zh. V. Kazaryan

Book ID
112348483
Publisher
Springer US
Year
1981
Tongue
English
Weight
163 KB
Volume
17
Category
Article
ISSN
0009-3122

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The title compounds were prepared from valine-derived N-acylated oxazolidin-2-ones, 1 ± 3, 7, 9, by highly diastereoselective ( ! 90%) Mannich reaction ( 3 4 ± 6; Scheme 1) or aldol addition ( 3 8 and 10; Scheme 2) of the corresponding Ti-or B-enolates as the key step. The superiority of the -5,5-di