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
Quinidine derivative (QD)2PYR was found to catalyze the asymmetric direct amination of unprotected prochiral 3-oxindole with DIAD to construct quaternary stereocenters at the C3 position with excellent enantioselectivity.
The bifunctional quinine-derived thiourea catalyst 14 was found to catalyze the direct amination of unprotected3-aryl and aliphatic substitutedoxindoles with di-tert-butylazodicarboxylate (DBAD) to construct a tetrasubstituted stereogenic carbon center at the C-3 position of oxindoles in good to excellent yield and enantioselectivity.
A Bench‐stable 8‐Aminoquinoline Derived Phosphine‐free Manganese (I)‐Catalyst for Environmentally Benign C(α)‐Alkylation of Oxindoles with Secondary and Primary Alcohols
作者:Parul Saini、Pritam Dolui、Abhishek Nair、Ashutosh Verma、Anil J. Elias
DOI:10.1002/asia.202201148
日期:2023.3.14
air-stable, phosphine-free 8-aminoqunoline (8-AQ) based Mn(I) carbonyl complex as the catalyst for the C(α)-alkylation of oxindoles with alcohols has been developed. The Mn complex [(8-AQ)Mn(CO)3Br] works effectively as a catalyst for α-alkylation of oxindoles by both secondary as well as primary alcohols. Few pharmaceutically relevant compounds were also synthesized by this method in good yields.