Polycyclic Pyrazoles from Alkynyl Cyclohexadienones and Nonstabilized Diazoalkanes via [3 + 2]-Cycloaddition/[1,5]-Sigmatropic Rearrangement/Aza-Michael Reaction Cascade
作者:Raj Kumar Patel、Priyankar Jha、Anil Chauhan、Ruchir Kant、Ravindra Kumar
DOI:10.1021/acs.orglett.3c03967
日期:2024.2.2
center substituted” polycyclic pyrazoles from alkynyl cyclohexa-2,5-dienones and nonstabilized diazoalkanes via sequential [3 + 2]-cycloaddition/[1,5]-sigmatropic rearrangement and aza-Michael reactions is reported. The developed process is highly regioselective and stereoselective. It employs a wide substrate scope to furnish structurally diverse linear and bridged [4.4.n.0] ring-fused pyrazoles in moderate
一种通过连续[3 + 2]-环加成/[1,5]-σ重排和氮杂-迈克尔反应从炔基环己-2,5-二烯酮和不稳定重氮烷立体选择性合成“全中心取代”多环吡唑的有效方法被报道。所开发的过程具有高度区域选择性和立体选择性。它采用广泛的基材范围来提供结构多样的线性和桥接[4.4。 n .0]稠环吡唑,产率中等至良好。还展示了一锅法和克级合成以及合成转化。