Ir(III)-Catalyzed C–H Functionalization of Triphenylphosphine Oxide toward 3-Aryl Oxindoles
作者:Qin-Xin Lou、Yuan Niu、Zhi-Chao Qi、Shang-Dong Yang
DOI:10.1021/acs.joc.0c00999
日期:2020.11.20
With triphenylphosphineoxide serving as both the directing group and the reagent, we have developed a Cp*Ir(III)-catalyzed direct C–H functionalization of triphenylphosphineoxide with 3-diazooxindoles to afford a range of 3-(2-(diphenylphosphoryl)phenyl)indolin-2-one derivatives in moderate to excellent yields. The title products are potentially important building blocks for organic synthesis through
‘On-water’ generation of carbonyl ylides from diazoamides: rhodium(II) catalyzed synthesis of spiroindolo-oxiranes and -dioxolanes with an interesting diastereoselectivity
作者:Sengodagounder Muthusamy、Rajagopal Ramkumar
DOI:10.1016/j.tet.2015.06.076
日期:2015.9
The ‘on-water’ generation of carbonylylide dipoles from diazoamides in the presence of rhodium(II) acetate dimer as the catalyst was demonstrated for the first time to synthesize spiroindolo-oxiranes and -dioxolanes. Unusual generation of carbonylylides with aromatic aldehydes having electron-withdrawing substituents and 1,3-dipolar cycloaddition reactions with aromatic aldehydes having electron-donating
Synthesis of Chiral 3-Substituted Hexahydropyrroloindoline via Intermolecular Cyclopropanation
作者:Hao Song、Jun Yang、Wei Chen、Yong Qin
DOI:10.1021/ol062489s
日期:2006.12.1
new and efficient syntheticroute to chiral 3-substituted hexahydropyrroloindoline 18 possessing absolute configurations in accordance with indole alkaloids has been developed from readily available L-tryptophan. The key step relies on the one-pot cascade reaction of oxazolidinone 17 with diazoester, which proceeds through intermolecular cyclopropanation, ringopening, and cyclization.
A versatile gold(I)-catalyzed cross-coupling reaction of 3-diazooxindoles with diazoesters has been presented, affording (E)-3-alkylideneoxindoles stereoselectively. Density functional theory calculations rationalized the chemo- and stereoselectivity of the reaction, which was in good agreement with experimental observations. In addition, (E)-3-alkylideneoxindoles were converted into their (Z)-isomers