期刊
SYNLETT
卷 -, 期 9, 页码 1449-1452出版社
GEORG THIEME VERLAG KG
DOI: 10.1055/s-0029-1216743
关键词
Mannich-type reaction; N,O-acetal; amino acid; hafnium triflate
资金
- MEXT
- Japan Private School Promotion Foundation
The authors demonstrated the Hf(OTf)(4)-catalyzed Mannich-type reaction of an enol silyl ether and a ketene silyl acetal with an NO-acetal leading to the preparation of amino acid derivatives. In particular, use of the N,O-acetal having a bis(trimethylsilyl)amino group directly produced N-unprotected aspartic acid derivatives after a standard aqueous workup.
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