A novel synthetic route to optically active 1,3-oxazolidines via formal [3 + 2] cycloaddition in the presence of cinchona-alkaloid-thiourea-based bifunctional organocatalysts is reported. This protocol gives easy access to a wide range of chiral 1,3-oxazolidines. In addition, the results show that bifunctional organocatalysts can effect the intramolecular aza-Michael addition, leading to the asymmetric synthesis of nitrogen-containing heterocycles.
报告了一种通过在
金鸡纳碱-
硫脲基双功能有机催化剂存在下,进行形式[3 + 2]环加成合成光学活性1,3-氧杂
环戊烷的新合成路线。该方法便于获得广泛的手性1,3-氧杂
环戊烷。此外,结果表明,双功能有机催化剂能够实现分子内氮杂Michael加成,从而导致氮含杂环的非对称合成。