A facile and economic method for the synthesis of (S)-N-Boc-3′-hydroxyadamantylglycine
作者:Jie Li、Xue Jiang、Run Gan、Ming Zhang、Xinmei Pan、Xiangnan Hu
DOI:10.1007/s11164-015-2398-2
日期:2016.6
ic acid (4), then through oximation, reduction and (Boc)2O protection to give the N -Boc-3′-hydroxyadamantylglycine(6), then was treated with quinidine to get (S)- N -Boc-3′-hydroxyadamantylglycine(I) and quinine to get (R)– N -Boc-3′-hydroxyadamantylglycine(II). Finally, Compound II was racemized by dicyclohexylcarbodiimide (DCC) and sodium hydride (NaH) to afford compound 6. In this route, the overall
(S) -N -Boc-3'-羟基金刚烷基甘氨酸 (I)是沙格列汀用于2型糖尿病(T2DM)的重要中间体。由1-金刚烷羧酸(1)与硫酸/硝酸,VHA试剂(SOCl 2 / DMF)和丙二酸二乙酯钠温和反应制得,然后进行水解,脱羧,碱化和氧化处理,得到2-( 3-羟基-1-金刚烷基)-2-氧乙酸(4),然后通过肟化,还原和(Boc)2 O保护得到 N - Boc -3'-羟基金刚烷基甘氨酸 (6),然后用奎尼丁处理得到(S) -N -Boc-3′-羟基金刚烷基甘氨酸 (I)和奎宁得到(R)– N -Boc-3'-羟基金刚烷基甘氨酸(II)。最后,用二环己基碳二亚胺(DCC)和氢化钠(NaH)使化合物II消旋,得到化合物6。在这种方法中,制备化合物I的总产率为约35%,对映体过量(ee)达到99%。该途径为制备(S) -N -Boc-3'-羟基金刚烷基甘氨酸 提供了新思路 。