Efficient Enzymatic Process for the Production of (2<i>S</i>)-4,4-Difluoro-3,3-dimethyl-<i>N</i>-Boc-proline, a Key Intermediate in the Synthesis of HIV Protease Inhibitors
作者:Shanghui Hu、Carlos A. Martinez、Billie Kline、Daniel Yazbeck、Junhua Tao、David J. Kucera
DOI:10.1021/op060004+
日期:2006.5.1
(2S)-4,4-Difluoro-3,3-dimethyl-N-Boc-proline (3) is a key intermediate for the synthesis of HIV protease inhibitors. Here, several approaches for the preparation of enantiopure 3 and its analogues are disclosed. Among these methods, one strategy relies on resolving the racemic methyl ester of 3 through a protease-catalyzed enantioselective hydrolysis. Despite the fact that this resolution was applied
(2S)-4,4-二氟-3,3-二甲基-N -Boc-脯氨酸(3)是合成HIV蛋白酶抑制剂的关键中间体。在此,公开了制备对映体3及其类似物的几种方法。在这些方法中,一种策略依赖于通过蛋白酶催化的对映选择性水解来拆分3的外消旋甲酯。尽管采用了该分辨率来制备千克量的光学纯酸3对于临床试验,该方法效率低,成本高且难以通过中等工程技术改进。因此,通过将脯氨酸酯的保护基团从Boc转换为苄基部分,开发了另一种效率更高且更具成本效益的酶促工艺。该新方法的通量更高(6.3 mmol / h / L vs. 0.11 mmol / h / L),而且该方法的成本也大大降低至蛋白酶拆分过程的5%。