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