A simple and convenient protocol for the synthesis of benzo[c]chromen-6-ones and 3-substitutedisocoumarins through a CuI-catalyzed tandemreaction of 2-bromobenzoates withcyclohexane-1,3-diones or acyclic 1,3-diones is developed. This strategy can also be extended to the one-pot synthesis of isoquinolin-1(2H)-one and 3,4-dihydrophenanthridine-1,6(2H,5H)-dione.
Rh(<scp>iii</scp>)-catalyzed C–H annulation of sulfoxonium ylides with iodonium ylides towards isocoumarins
作者:Chuanliu Yin、Lianghao Li、Chuanming Yu
DOI:10.1039/d1ob02273c
日期:——
The direct synthesis of isocoumarin skeletons has been realized through the Rh(III)-catalyzed [3 + 3] annulation of sulfoxonium ylides with iodonium carbenes. The synthetic protocol was constructed efficiently with broad functional group tolerance and mild reaction conditions. This reaction can be formally viewed as the result of C–H activation, carbene insertion and nucleophilic addition processes
Rh(<scp>iii</scp>)-catalyzed C–H/C–C bond annulation of enaminones with iodonium ylides to form isocoumarins
作者:Zi Yang、Chaoshui Liu、Jieni Lei、Yi Zhou、Xiaohui Gao、Yaqian Li
DOI:10.1039/d2cc05899e
日期:——
isocoumarins via Rh(III)-catalyzed C–H/C–C bond activation/annulation cascade of enaminones and iodonium ylides has been explored. The established protocol is characterized by an exceedingly simple reaction system, high regioselectivity and good functional group tolerance. Moreover, this strategy may provide a new route to cleavage of the C(sp2)–C(O) bond of unstrained ketones.
已经探索了一种通过Rh( III ) 催化的烯胺酮和碘鎓叶立德的 C-H/C-C 键活化/环化级联合成异香豆素的直接方法。所建立的方案具有极其简单的反应体系、高区域选择性和良好的官能团耐受性的特点。此外,该策略可能为未应变酮的 C(sp 2 )–C(O) 键的裂解提供一条新途径。
Rh(III)-Catalyzed Synthesis of Isocoumarins via C–H Activation of Phenacyl Phosphoniums with Iodonium Ylides
A phosphonium-assisted C–H cyclization with iodonium ylides has been developed under redox-neutral rhodium(III) catalysis, offering a wide variety of valuable isocoumarins in moderate to good yields. This transformation proceeds through C–H activation, carbene insertion, and nucleophilic addition processes. The reaction occurs under a low catalyst loading in a short reaction time and does not require
Synthesis of Angular Polycyclic Aromatic Molecules via Rh(III)‐Catalyzed C−H Annulation of Nitrones with Cyclic 2‐Diazo‐1,3‐diones
作者:Yan Wang、Li‐Ming Zhao
DOI:10.1002/adsc.202300720
日期:2023.11.7
We herein disclose a simple and general method for the synthesis of chromendiones through Rh(III)-catalyzed C−H functionalization/annulation reactions of nitrones with cyclic 2-diazo-1,3-diones by using nitrone group as a traceless directing group. This method exhibits high efficiency and broad functional group compatibility. The derivatization of these chromendiones has been also demonstrated to further