(-)-cytoxazone及其立体异构体(-)-4- Epi- cytoxazone(新型细胞因子调节剂)的简明合成已由易于获得的对-茴香醛以良好的非对映选择性在六个步骤中完成。合成的关键步骤包括用异磺酰氯磺化抗-和顺-1,2-二甲基醚的区域选择性和非对映选择性胺化,以及随后二醇的区域选择性环化反应,以构建恶唑烷-2-酮核。Cieplak电子模型通过S N 1机理和邻近基团效应解释了使用CSI进行胺化反应的非对映选择性,从而保留了构型。
total synthesis of (-)-cytoxazone 1 was achieved in six linear steps (34% overall yield) from p-anisaldehyde. The key steps in this route are the regioselective and stereoselective introduction of a N-protected amine group, using the CSI reaction of the anti-1,2-dimethyl ether 3, and the subsequent regioselective cyclization of the N-protected amino diol 13 to give the 2-oxazolidinone unit of (-)-cytoxazone