Facile synthesis of asymmetric quaternary centers based on diastereoselective protection of the carbonyl group at the symmetrical position
作者:Kou Hiroya、Yusuke Ichihashi、Yoshihiro Suwa、Tetsuro Ikai、Kiyofumi Inamoto、Takayuki Doi
DOI:10.1016/j.tetlet.2010.05.010
日期:2010.7
The C2-side chain hydroxyl group of 1,3-cycloalkanedione discriminates between two ketones depending on its chirality. It chooses one ketone to form hydrogen bond with the oxygen atom of the TBDPS–oxymethyl group, but chooses the other ketone upon conversion to the isopropyl acetal. Two optically pure diastereomers, whose absolute configuration at the angular position is opposite for each other, were