A concise synthesis of (−)-cytoxazone and (−)-4-epi-cytoxazone using chlorosulfonyl isocyanate
作者:In Su Kim、Ji Duck Kim、Chae Baek Ryu、Ok Pyo Zee、Young Hoon Jung
DOI:10.1016/j.tet.2006.07.073
日期:2006.10
A concise synthesis of (−)-cytoxazone and its stereoisomer (−)-4-epi-cytoxazone, novel cytokine modulators, has been accomplished each in six steps from readily available p-anisaldehyde with good diastereoselectivity. Key steps in the synthesis include the regioselective and diastereoselective amination of anti- and syn-1,2-dimethyl ethers with chlorosulfonyl isocyanate and the subsequent regioselective
(-)-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。