作者:Alexander Heim-Riether
DOI:10.1055/s-2008-1032194
日期:2008.3
Herein we describe an efficient and practical route for the regioselective synthesis of 4-(5-bromo/chloropyrazol-1-yl)-2-aminobutyric acids. The compounds have been prepared by regioselective C-5 halogenation of 1-(3,3-dimethoxypropyl)-1H-pyrazole followed by a Strecker synthesis. In addition, Boc-protected 2-amino-4-(2-chlorophenyl)butyric acid and 2-amino-4-(3-chloropyridin-2-yl)butyric acid have been synthesized.
在此,我们介绍了一种高效实用的 4-(5-溴/氯吡唑-1-基)-2-氨基丁酸的区域选择性合成路线。这些化合物是通过 1-(3,3-二甲氧基丙基)-1H-吡唑的区域选择性 C-5 卤化反应,然后用 Strecker 合成法制备的。此外,还合成了受 Boc 保护的 2-氨基-4-(2-氯苯基)丁酸和 2-氨基-4-(3-氯吡啶-2-基)丁酸。