A rare, ruthenium‐catalyzed, oxazolinlyl assistedC−Hfunctionalization and three‐componentcascadecyclization for the synthesis of isoquinolinones via a metal‐carbenemigratoryinsertion is reported. The transformation is unique since it involves the formation of multiple bonds in onepot via C−Hfunctionalization and ring opening of oxazolines. Detailed mechanistic investigations reveal interesting
S–Co(II) cascade catalysis: cyclocondensation of aromatic nitriles with alkamine
作者:Haixia Ge、Ping Liu、Xiangnan Li、Wei Sun、Jianli Li、Bingqin Yang、Zhen Shi
DOI:10.1016/j.tet.2013.05.132
日期:2013.8
A solvent-free S/Co(NO3)2 cascade catalyzed cyclocondensation reaction of aromaticnitriles with 3-amino-1-propanol or 2-aminoethanol has been successfully developed under thermal and microwave conditions. By this two-component protocol, mono- and bis-oxazines and oxazolines were selectively synthesized both in good to excellent yields and short reaction times. This catalytic system exhibits excellent
Oxazolinyl-Assisted C–H Amidation by Cobalt(III) Catalysis
作者:Ruhuai Mei、Joachim Loup、Lutz Ackermann
DOI:10.1021/acscatal.5b02661
日期:2016.2.5
Cobalt-catalyzed C–H activation by means of oxazolinyl assistance set the stage for versatile direct amidations with ample substrate scope. Thus, a high-valent cobalt(III) catalyst enabled C–H amidations with excellent levels of positional and chemo-selectivities. Mechanistic studies provided strong support for a kinetically relevant C–H functionalization.
An Efficient Oxidative Conversion of Aldehydes into 2-Substituted 2-Oxazolines Using 1,3-Diiodo-5,5-dimethylhydantoin
作者:Hideo Togo、Shogo Takahashi
DOI:10.1055/s-0029-1216843
日期:2009.7
Various aromatic and aliphatic aldehydes were converted into the corresponding 2-aryl and 2-alkyl-2-oxazolines, respectively, in good to high yields by reaction with 2-aminoethanol and 1,3-diiodo-5,5-dimethylhydantoin. Moreover, chiral bis-2-oxazolines, which can be used as chiral ligands in asymmetric synthesis, could be also prepared in moderate yields by the reaction of dialdehydes with (R)-(-)-2-phenylglycinol