开发了一种新型 Rh( III ) 催化的酞嗪酮或哒嗪酮与各种丙二烯的环化反应,从而以中等至良好的产率形成带有季碳的吲唑衍生物。目标产物通过连续的C-H活化和烯烃插入,然后是β-氢化物消除和分子内环化来合成。合成方案有效地进行,具有广泛的官能团耐受性、高原子效率和高Z选择性。通过合成转化证明了该方法的实用性。
Expedient synthesis of new cinnoline diones by Ru-catalyzed regioselective unexpected deoxygenation-oxidative annulation of propargyl alcohols with phthalazinones and pyridazinones
作者:Subramani Rajkumar、S. Antony Savarimuthu、Rajendran Senthil Kumaran、C. M. Nagaraja、Thirumanavelan Gandhi
DOI:10.1039/c5cc09347c
日期:——
Ruthenium-catalyzed simple, cascade and one-pot synthesis of cinnoline-fused diones has been carried out by the C–H activation of phthalazinones/pyridazinones.
Rhodium-Catalyzed [4 + 1] Cyclization via C–H Activation for the Synthesis of Divergent Heterocycles Bearing a Quaternary Carbon
作者:Xiaowei Wu、Haitao Ji
DOI:10.1021/acs.joc.8b00397
日期:2018.4.20
development of an efficient approach to construct fused polycyclic systems bearing a quaternarycarbon center represents a great challenge to synthetic chemistry. Herein, we report a Rh(III)-catalyzed [4 + 1] annulation of propargyl alcohols with various heterocyclic scaffolds under an air atmosphere. Diverse fused heterocycles containing a quaternarycarbon center were obtained in moderate to good