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
1,3-环烷二酮的C2侧链羟基取决于手性,可在两个酮之间进行区分。它选择一种酮与TBDPS-氧甲基的氧原子形成氢键,但在转化为异丙基乙缩醛时选择另一种酮。因此,通过简单的操作从该单一手性源合成了两个光学纯的非对映异构体,它们在角位置处的绝对构型彼此相反。该方法可用于合成具有不对称季中心的各种化合物。