Formal [3+2] Cycloaddition of Ketenes and Oxaziridines Catalyzed by Chiral Lewis Bases: Enantioselective Synthesis of Oxazolin-4-ones
作者:Pan-Lin Shao、Xiang-Yu Chen、Song Ye
DOI:10.1002/anie.201003532
日期:2010.11.2
Choose the right cat.: A highly enantioselective synthesis of oxazolin‐4‐ones by the formal [3+2] cycloaddition of ketenes and a racemic oxaziridines has been developed (see scheme; cat.=N‐heterocyclic carbenes for disubstituted ketenes or cinchona alkaloids for monosubstituted ketenes, Ts=4‐toluenesulfonyl).
选择合适的猫。:已开发出通过对烯酮的正式[3 + 2]环加成和外消旋的恶氮丙啶进行高度对映选择性的恶唑啉-4-酮的合成(参见方案; cat。= N-杂环卡宾用于双取代的烯酮,或金鸡纳生物碱用于单取代的酮, Ts = 4-甲苯磺酰基)。