Heterocycles from Morita–Baylis–Hillman adducts: synthesis of 5-oxopyrazolidines, arylidene-5-oxopyrazolidines, and oxo-2,5-dihydro-pyrazols
作者:José Tiago M. Correia、Manoel T. Rodrigues、Hugo Santos、Cláudio F. Tormena、Fernando Coelho
DOI:10.1016/j.tet.2012.10.057
日期:2013.1
Starting from Morita–Baylis–Hillman (MBH) adducts, an approach for the synthesis of oxopyrazolidines, arylidene-oxopyrazolidines, and oxo-2,5-dihydropyrazoles is described. The method is based on a tandem process involving a Michael addition of amino-guanidine into silylated and acetylated MBH adducts, followed by intramolecular cyclization. The use of acetylated MBH adducts led also to the synthesis
从Morita-Baylis-Hillman(MBH)加合物开始,描述了一种合成氧代吡唑烷,亚芳基-氧代吡唑烷和oxo-2,5-二氢吡唑的方法。该方法基于串联过程,该过程包括将氨基胍的迈克尔加成到甲硅烷基化和乙酰化的MBH加合物中,然后进行分子内环化。乙酰化的MBH加合物的使用也导致了不寻常的吡唑的合成,这是由意外的碱介导的平衡所促进的。