Optically pure (R)-4, 4-diethoxy-2-(hydroxymethyl)butyl acetate (1) was synthesized enantioselectively by lipase-catalyzed transesterification from 4, 4-diethoxy-2-(hydroxymethyl)butanol. Coupling of silylated nucleobases and 2-O-acetyl-5-O-pivaloyl-(3S)-2, 3-dideoxyapiose (2) prepared from 1 was found to proceed smoothly in the presence of a catalytic amount of trimethylsilyl iodide under mild conditions to afford optically active nucleoside analogs.
光学纯的(R)-4, 4-二乙氧基-2-(羟甲基)
丁酸乙酯(1)是通过
脂肪酶催化的酯交换反应,从4, 4-二乙氧基-2-(羟甲基)
丁醇合成得到的。发现将
硅化的核苷碱基与从1制备的2-O-乙酰基-5-O-匹伐酰基-(3S)-2, 3-脱氧阿
葡萄糖(2)在温和条件下,在催化量的三甲基
硅基
碘化物存在下,可以顺利进行反应,生成光学活性的核苷类似物。