An Oxazolo[3,2-<i>b</i>]indazole Route to 1<i>H</i>-Indazolones
作者:James S. Oakdale、Danielle M. Solano、James C. Fettinger、Makhluf J. Haddadin、Mark J. Kurth
DOI:10.1021/ol900891s
日期:2009.7.2
The novel heterocycle 2,3-dihydrooxazolo[3,2-b]indazole has been synthesized and utilized to provide easy access to 1H-indazolones, particularly the previously unreported 2-(2-alkoxyethyl)-1H-indazol-3(2H)-ones. Mechanistic as well as optimization and reaction scope studies are reported.
Photocatalyst‐free Synthesis of Indazolones under CO
<sub>2</sub>
Atmosphere
A convenient photocatalyst‐free method for the synthesis of redox‐active 1,2‐dihydro‐3H‐indazol‐3‐one derivatives from (2‐nitroaryl)methanol and amines was developed. The reaction proceeded efficiently at room temperature by irradiation of UV lightunder CO2 atmosphere (1.0 atm, flow) without any photocatalysts or additives. This mild, operationally simple method shows wide functional tolerance. The