Selective oxidation of O-isopropylidene derivatives of diols to 2-hydroxy ketones employing dioxiranes
作者:Ruggero Curci、Lucia D'Accolti、Anna Dinoi、Caterina Fusco、Angela Rosa
DOI:10.1016/0040-4039(95)02087-x
日期:1996.1
transformed into homochiral 2-hydroxy ketones in high optical yield, and with preservation of configuration at the C∗OH chiral center proximal to that undergoing oxidation to carbonyl. The diacetonide of 1,4-Diphenylbutan-1,2:3,4-tetraol could be selectively converted into 1,4-diphenyl-1-oxo-2-hydroxy 3,4-acetonide, with removal of just one acetonide moiety.
使用二甲基二环氧乙烷(1a)或甲基(三氟甲基)二环氧乙烷(1b),可以在温和的条件下高产率地将1,2-二醇的O-异亚丙基衍生物直接转化为相应的2-羟基酮。旋光性乙炔化物以高光学收率转化为同手性2-羟基酮,并在靠近C = OH的手性中心处保留构型,该构型接近于氧化为羰基的手性中心。可以仅除去一个丙酮化物部分,将1,4-二苯基丁烷-1,2:3,4-四元醇的二丙酮化物选择性地转化为1,4-二苯基-1-氧代-2-羟基3,4-丙酮化物。