Nonproteinogenic amino acids:: an efficient asymmetric synthesis of (S)-(-)-acromelobic acid and (S)-(-)-acromelobinic acid

被引:21
|
作者
Adamczyk, M [1 ]
Akireddy, SR [1 ]
Reddy, RE [1 ]
机构
[1] Abbott Labs, Div Diagnost, Dept Chem, Abbott Pk, IL 60064 USA
关键词
nonproteinogenic amino acids; total synthesis; acromelobic acid; acromelobinic acid;
D O I
10.1016/S0040-4020(02)00670-1
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
An efficient synthesis of (S)-(-)-acromelobic acid (1) and (S)-(-)-acromelobinic acid (2) is described via asymmetric hydrogenation protocol. Asymmetric hydrogenation of dehydroamino acid derivative 23 using (R,R)-[Rh(DIPAMP)(COD)]BF4 catalyst followed by removal of the protective groups afforded (S)-(-)-acromelobic acid (1) in >98% ee. The key intermediate 23 was prepared from citrazinic acid (8). The dehydroamino acid derivative 33 required for the synthesis of (S)-(-)-2 was prepared from 2,5-lutidine (27), which upon hydrogenation using (S,S)-[Rh(Et-DuPHOS)(COD)]BF4 catalyst afforded (S)-(+)-34 in 93% yield and >96% ee. Removal of protective groups in (S)-(+)-34 afforded (S)-(-)-acromelobinic acid (2) in good overall yield. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:6951 / 6963
页数:13
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