化学
环加成
西格玛反应
级联
药物化学
组合化学
立体化学
有机化学
催化作用
色谱法
作者
Raj Patel,Priyankar Jha,Anil Chauhan,Ravi Kant,Ravindra Kumar
标识
DOI:10.1021/acs.orglett.3c03967
摘要
An efficient method for the stereoselective synthesis of "all 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 to good yields. One-pot and gram-scale syntheses and synthetic transformations have also been showcased.
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