Rh(III)-catalyzed C-H activation of primary benzamides and tandem cyclization with cyclic 2-diazo-1,3-diketones for the synthesis of isocoumarins
作者:Xinwei He、Guang Han、Youpeng Zuo、Yongjia Shang
DOI:10.1016/j.tet.2018.10.045
日期:2018.12
A simple and efficient Rh(III)-catalyzed C-Hactivation and tandem intramolecular cyclization for the synthesis of isocoumarins has been developed. The protocol uses easily available primary benzamides and cyclic 2-diazo-1,3-diketones as starting materials. This reaction proceeds via C-C and C-O bond formation in a single reaction vessel, and the corresponding isocoumarins were obtained in moderate
Rh(
<scp>III</scp>
)‐Catalyzed Diverse C—H Functionalization of Iminopyridinium Ylides
作者:Zhenzhen Dong、Pengfei Li、Xingwei Li、Bingxian Liu
DOI:10.1002/cjoc.202100203
日期:2021.9
Divergent synthesis of useful skeletons has been realized via rhodium(III)-catalyzed C—H activation of iminopyridinium ylides and coupling with various unsaturated coupling reagents. Isocoumarins and isoquinolones were obtained via cleavage of the C—N or N—N bond in the ylidic directing group, while fluorinated alkenes were delivered with the directing group intact. The reactions occurred with wide
A mild and efficient Rh(III)-catalyzed C–H activation/esterification reaction for the synthesis of isocoumarins has been developed. This procedure uses readily available benzoic acids and cyclic diazo-1,3-diketones as starting materials and involves domino intermolecular C–H activation in combination with intramolecular esterification to give the corresponding isocoumarins in moderate to excellent
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。