An asymmetric pericyclic cascade approach to 3-alkyl-3-aryloxindoles: generality, applications and mechanistic investigations
作者:Edward Richmond、Kenneth B. Ling、Nicolas Duguet、Lois B. Manton、Nihan Çelebi-Ölçüm、Yu-Hong Lam、Sezen Alsancak、Alexandra M. Z. Slawin、K. N. Houk、Andrew D. Smith
DOI:10.1039/c4ob02526a
日期:——
The reaction of l-serine derived N-arylnitrones with alkylarylketenes generates 3-alkyl-3-aryloxindoles in good yields and excellent enantioselectivities.
A novel catalytic hydrogen‐autotransfer protocol for the atom‐efficient α‐alkylation of ketones with readily available alcohols is presented. The use of manganese complexes bearing non‐innocent PNP pincer ligands enabled the functionalization of a broad range of valuable ketones, including 2‐oxindole, estrone 3‐methyl ether, and testosterone. Mechanistic investigations suggest the participation of
Magnesium-Catalyzed Electrophilic Trifluoromethylation: Facile Access to All-Carbon Quaternary Centers in Oxindoles
作者:Dmitry Katayev、Harutake Kajita、Antonio Togni
DOI:10.1002/chem.201700851
日期:2017.6.22
The first example of a magnesium-catalyzed direct trifluoromethylation of 3-substituted oxindoles using an electrophilichypervalentiodinereagent is reported. The reaction proceeds under unprecedented mild conditions leading to the formation of an all-carbon quaternary center in oxindoles in high chemical yield and demonstrates excellent functional group tolerance. In addition to trifluoromethyl
Iron‐Catalyzed Cross‐Dehydrogenative Coupling of Oxindoles with Thiols/Selenols for Direct C(
<i>sp</i>
<sup>
<i>3</i>
</sup>
)−S/Se Bond Formation
作者:Lu‐Shan Huang、Dong‐Yang Han、Da‐Zhen Xu
DOI:10.1002/adsc.201900400
日期:2019.9.3
The C−X (S/Se) bonds are common and ubiquitous in natural products and pharmaceuticals. Here, we report an iron‐catalyzedcross‐dehydrogenativecoupling (CDC) reaction for the direct synthesis of C(sp3)−X (S/Se) bonds from oxindoles, phenylacetamides, pyrazolones, phenylacetonitriles and ethyl cyanoacetate with thiols and selenols. All the reactions were performed under simple and mild conditions,
Iron‐Catalyzed Borrowing Hydrogen
<i>C</i>
‐Alkylation of Oxindoles with Alcohols
作者:Mubarak B. Dambatta、Kurt Polidano、Alexander D. Northey、Jonathan M. J. Williams、Louis C. Morrill
DOI:10.1002/cssc.201900799
日期:——
general and efficient iron‐catalyzed C‐alkylation of oxindoles has been developed. This borrowing hydrogen approach employing a (cyclopentadienone)iron carbonyl complex (2 mol %) exhibited a broad reaction scope, allowing benzylic and simple primary and secondary aliphatic alcohols to be employed as alkylating agents. A variety of oxindoles underwent selective mono‐C3‐alkylation in good‐to‐excellent