Expedient Synthesis of Alphitolic Acid and Its Naturally Occurring 2-<i>O</i>-Ester Derivatives
作者:Somin Park、Jihee Cho、Hongjun Jeon、Sang Hyun Sung、Seunghee Lee、Sanghee Kim
DOI:10.1021/acs.jnatprod.8b00986
日期:2019.4.26
expedient synthesis of alphitolic acid (1) as well as its natural C-3-epimer and 2- O-ester derivatives was accomplished in a few steps from the readily commercially available betulin (9). A Rubottom oxidation delivered an α-hydroxy group in a stereo- and chemoselective manner. The diastereoselective reduction of the α-hydroxy ketone was key to accessing the 1,2-diol moiety of this class of natural products
从便利的市售甜菜素(9)只需几步即可完成合成方便的合成α-羟乙酸(1)以及其天然的C-3-epimer和2-O-酯衍生物的步骤。Rubottom氧化以立体和化学选择性方式递送α-羟基。α-羟基酮的非对映选择性还原是获得此类天然产物的1,2-二醇部分的关键。我们简洁明了的立体选择性合成方案使这些天然产物的克级合成成为可能,这将有助于将来的生物学评估。