Intramolecular Carbonylation Reactions with Recyclable Palladium-Complexed Dendrimers on Silica: Synthesis of Oxygen, Nitrogen, or Sulfur-Containing Medium Ring Fused Heterocycles
作者:Shui-Ming Lu、Howard Alper
DOI:10.1021/ja053650h
日期:2005.10.1
Palladium-complexeddendrimers supported on silica were evaluated as catalysts for intramolecular carbonylation reactions. The results showed that dendritic catalysts display high activity, affording oxygen, nitrogen, or sulfur-containing seven- or eight-membered ring fused heterocycles in excellent yields. Moreover, these catalysts have competitive advantages in that they can be easily recovered by
An unprecedented highly stereoselective synthesis of pyrrolo[1,2-d][1,4]oxazepin-3(2H)-ones has been accomplished via photoredox/N-heterocycliccarbene (NHC) relay catalysis. A wide range of substituted dibenzoxazepines and aryl/hetereoaryl enals were well accommodated under the organic photoredox catalysis-promoted amine oxidation to generate the imines, followed by a NHC-catalyzed [3 + 2] annulation
通过光氧化还原/ N-杂环卡宾 (NHC) 中继催化,实现了前所未有的高度立体选择性合成吡咯并 [1,2- d ][1,4]oxazepin-3(2 H )-ones。有机光氧化还原催化促进胺氧化生成亚胺,然后进行 NHC 催化的 [3 + 2] 环化反应,以实现优异的非对映和对映选择性二苯并恶氮杂合吡咯烷酮。
BREWSTER K.; CLARKE R. J.; HARRISON J. M.; INCH T. D.; UTLEY D., J. CHEM. SOC. PERKIN TRANS., PART 1 <JCPK-BH>, 1976, NO 12, 1286-1290
作者:BREWSTER K.、 CLARKE R. J.、 HARRISON J. M.、 INCH T. D.、 UTLEY D.