Enantiomerically Pure α-Amino Acid Synthesis via Hydroboration−Suzuki Cross-Coupling
作者:Philip N. Collier、Andrew D. Campbell、Ian Patel、Tony M. Raynham、Richard J. K. Taylor
DOI:10.1021/jo010865a
日期:2002.3.1
compound 25 undergo hydroboration with 9-BBN-H followed by palladium-catalyzed Suzuki coupling reactions with aryl and vinyl halides. After one-pot hydrolysis-oxidation, a range of known and novel nonproteinogenic amino acids were isolated as their N-protected derivatives. These novel organoborane homoalanine anion equivalents are generated and transformed under mild conditions and with wide functional
Garner醛衍生的亚甲基烯烃5和相应的苄氧羰基化合物25与9-BBN-H进行氢硼化,然后与芳基和乙烯基卤化物进行钯催化的Suzuki偶联反应。一锅水解氧化后,分离出一系列已知和新颖的非蛋白氨基酸作为其N保护的衍生物。这些新颖的有机硼烷高丙氨酸阴离子当量是在温和条件下产生的,并且具有宽泛的官能团耐受性:富电子和贫芳香族碘化物和溴化物(以及乙烯基溴化物)都经过有效的Suzuki偶联。还介绍了此方法的扩展,以制备介孔DAP,R,R-DAP和R,R-DAS。