Iridium(<scp>iii</scp>)-catalysed annulation of pyrazolidinones with propiolates: a facile route to pyrazolo[1,2-<i>a</i>] indazoles
作者:Zi Yang、Zhenyu Song、Lianghua Jie、Lianhui Wang、Xiuling Cui
DOI:10.1039/c9cc02232e
日期:——
A facile synthesis of various pyrazolo[1,2-a] indazoles from pyrazolidinones and propiolates via iridium(III)-catalysed C–H bond activation/subsequent [4+1] cyclization has been developed. The reaction proceeds smoothly under mild reactionconditions and propiolates act as a novel C1 synthon. This transformation represents a redox-neutral process, exhibits a highly regioselectivity, and tolerates various
已经开发了一种通过铱(III)催化的C–H键活化/随后的[4 + 1]环化反应从吡唑啉酮和丙酸酯轻松合成各种吡唑并[1,2- a ]吲唑的方法。在温和的反应条件下,反应平稳进行,丙酸酯作为新型C 1合成子。该转变代表氧化还原中性过程,表现出高度的区域选择性,并能耐受各种官能团。
Ruthenium(II)-Catalyzed Regioselective [3 + 2] Spiroannulation of 2<i>H</i>-Imidazoles with 2-Alkynoates
作者:Zhenyu Song、Zi Yang、Pu Wang、Zhaojiang Shi、Tingfang Li、Xiuling Cui
DOI:10.1021/acs.orglett.0c02024
日期:2020.8.21
The C═N double bond of 2H-imidazole has been employed as a C-electrophile for the ruthenium(II)-catalyzed [3 + 2] spiroannulation reaction of 4-phenyl-2H-imidazoles and 2-alkynoates to synthesize spiroimidazole-4,1′-indenes. This strategy features high regioselectivity, broad functional group tolerance, and use of ruthenium as a catalyst, providing a new method to synthesize spirocycles with potential