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6-Amino-2,4,5-trimethylpyridin-3-ols: A new general synthetic route and antiangiogenic activity
( Dong Guk Kim ) , ( Youra Kang ) , ( Hyunji Lee ) , ( Eun Kyung Lee ) , ( Tae Gyu Nam ) , ( Jung Ae Kim ) , ( Byeong Seon Jeong )
UCI I410-ECN-0102-2015-500-002240524
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A new synthetic strategy for preparation of a wide range of 6-amino-2,4,5-trimethylpyridin-3-ols from pyridoxine·HCl via a six-step sequence has been developed. This approach features an introduction of various amino groups to C(6)-position of 3-benzyloxy-6-bromo-2,4,5-trimethylpyridine (13), a key intermediate, by a Buchwald-Hartwig amination reaction using palladium(0) transition metal, which certainly renders an expanded scope of amino substituents. Some analogs prepared using the methods described here showed high level of antiangiogenic and antitumor activities in chick chorioallantoic membrane (CAM) assay, demonstrating the potential of these new aminopyridinols as antiangiogenic agents.ⓒ2014 Elsevier Masson SAS. All rights reserved.

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