Synthesis of 2-Aryl/Heteroaryloxazolines from Nitriles under Metal- and Catalyst-Free Conditions and Evaluation of Their Antioxidant Activities
摘要:
The synthesis of structurally diverse 2-aryl/heteroaryloxazolines from nitriles and aminoalcohols has been achieved under metal- and catalyst-free conditions in good to excellent yields. An array of functional groups are well-tolerated, thus, allowing the introduction of many important biologically active motifs such as azoles, ring-fused azoles, saturated heterocyclics, and amines in 2-aryloxazoline scaffolds. An evaluation of the antioxidant properties using the DPPH (diphenyl picryl hydrazyl) assay method shows the pyrrole-functionalized 2-aryloxazoline to be the best antioxidant among all the synthesized 2-aryl/heteroaryloxazolines.
Efficient and Selective Hydrosilylation of Secondary and Tertiary Amides Catalyzed by an Iridium(III) Metallacycle: Development and Mechanistic Investigation
Readily accessible cationic IrIII metallacycles catalyze efficiently the chemoselective hydrosilylation of tertiary and secondaryamides to amines. The catalyst described herein operates at low loadings using inexpensive 1,1,3,3-tetramethyldisiloxane and allows fast reactions with high yields, selectivities, and turnover numbers. A transient iminium intermediate has been observed for the first time
One-Pot Reductive N-Alkylation with Carbonyl Compounds To Give Tertiary Amines via Borane Reduction of Imines
作者:Tetsuo Ohta、Masashi Tokizane、Kaori Sato、Yuki Sakami、Yoichiro Imori、Chika Matsuo、Yoshihiko Ito
DOI:10.1055/s-0029-1217076
日期:2010.1
borane-mediated reduction of imines and reductive N-alkylation with carbonylcompounds is described. This protocol’s reducing agent is only borane in the reduction of imines, and additional reductant is not necessary in reductive N-alkylation step. When using more than two equivalents of aldehydes, reductive N-alkylation proceeded in good yield. reductive N-alkylation -boranereduction- imines - tertiary
photoredox catalyst proceed smoothly to give the corresponding alkyl‐substituted arenes in good to high yields. The present reaction system realizes a novel C−C bond‐forming reaction between two fragments generated from the C−C bond‐cleavage reactions of two independent substrates.