Improvement in aluminum complexes bearing a Schiff base in ring-opening polymerization of ε-caprolactone: the synergy of the N,S-Schiff base in a five-membered ring aluminum system
period was observed when the five-membered ring aluminum complexes bearing thiol-Schiff base ligands were used compared with the other types of aluminum complexes bearing Schiff base ligands. The electron-withdrawing groups enhanced the catalyticactivity of the Alcomplexes compared with the electrondonating groups. The thiol-Schiff base ligand and the five-membered ring aluminum catalysis had a synergistic
Cyanide as a Powerful Catalyst for Facile Preparation of 2-Substituted Benzoxazoles<i>via</i>Aerobic Oxidation
作者:Yeon Ho Cho、Chun-Young Lee、Deok-Chan Ha、Cheol-Hong Cheon
DOI:10.1002/adsc.201200684
日期:2012.11.12
synthesis of 2-substituted benzoxazoles from Schiff bases via aerobic oxidation has been developed. The products from various Schiff bases were obtained in high yields in an open flask under ambient conditions without other external oxidants. We have also developed a simple one-step protocol for the synthesis of benzoxazoles from aminophenol and the corresponding aldehydes in the presence of cyanide without
A series of functionalized 2,3-dihydro-1,4-benzoxazines were obtained in moderate to excellent yields via domino [5 + 1] annulations of 2-halo-1,3-dicarbonyl compounds 2 with imines 1 under mild conditions and the application of this method in the synthesis of bioactive analogues, such as functionalized tetracyclic-1,4-benzoxazines which contain two new heterocyclic rings and one quaternary carbon
Catalyst-free allylation of 2-aminophenol–derived aldimines with allyltrichlorosilane under thermal conditions
作者:Kesa Venkatanna、Chinnasamy Ramaraj Ramanathan
DOI:10.1016/j.tetlet.2017.08.012
日期:2017.9
Allylation of 2-aminophenol-derived aldimines using allyltrichlorosilane undercatalystfreeconditions has been developed. This reaction afforded the corresponding homoallylic amines in good to excellent yields (68–94%). The salicylaldehyde-derived aldimines as well as benzoylhydrazone also found to react with allyltrichlorosilane smoothly under the same conditions, to furnish the corresponding homoallylic
Directed Amination of Aryl Methyl Ethers Mediated by Ti(NMe<sub>2</sub>)<sub>4</sub>at Room Temperature
作者:Zhou Chen、Jinna Liu、Hao Pei、Wei Liu、Yanmei Chen、Jian Wu、Wu Li、Yahong Li
DOI:10.1021/acs.orglett.5b01229
日期:2015.7.17
An efficient C–O amination of arylmethylethers has been achieved. This transformation proceeds via imine-directed Ti(IV)-mediated cross-coupling reactions between arylmethylethers and Ti(NR2)4 at room temperature, straightforwardly leading to a series of arylamines. This protocol features a wide substrate scope, exclusive regioselectivity, and mild reaction conditions.