The reaction of alkylidenephosphoranes with acyl chlorides proceeds by transylidation. Starting from an alkylidenephosphorane containing an chiral P-atom and an optical active acyl chloride, partial kinetic resolution of the organophosphorus compound is observed. The reaction of 1-carboethoxyethylidenenaphthylphenylmethylphosphorane with an optical active acyl chloride proceeds by simultaneous kinetic
Nickel-Catalyzed Transformation of Diazoacetates to Alkyl Radicals Using Alcohol as a Hydrogen Source
作者:Jingjing Zhao、Pan Li、Yaohua Xu、Yixin Shi、Fuwei Li
DOI:10.1021/acs.orglett.9b03610
日期:2019.12.6
transformation of diazoacetates to α-carbonyl methylene radicals has been disclosed in the presence of hyperoxide using ethanol as a hydrogen source and solvent. This strategy is successfully applied in the formation of indolin-2-ones or 1,4-dicarbonyl compounds from acrylamides or enamides in moderate to good yields. These reactions undergo radical addition onto C-C double bonds followed by a cyclization/oxidation
<i>N</i>,<i>N</i>‘-Ditosylhydrazine: A Convenient Reagent for Facile Synthesis of Diazoacetates
作者:Tatsuya Toma、Jun Shimokawa、Tohru Fukuyama
DOI:10.1021/ol701432k
日期:2007.8.1
A novel entry to the synthesis of diazoacetates is disclosed. A variety of diazoacetates were synthesized from the corresponding bromoacetates by treatment with N,N'-ditosylhydrazine in moderate to high yields. Ease of operation with the stable crystalline reagent as well as a short reaction time offer a useful alternative to the conventional methods.
Herein we show that the 3-hydroxyquinolin-2(1H)-one (3HQ) core is a suitable platform to develop new compounds with anticancer activity against MCF-7 (IC50 up to 4.82 μM) and NCI–H460 (IC50 up to 1.8 μM) cancer cell lines. The ring-expansion reaction of isatins with diazo esters catalysed by di-rhodium (II) complexes proved to be a simple and effective strategy to synthesize 4-carboxylate-3HQs (yields
Photocatalytic Generation of π-Allyltitanium Complexes from Butadiene via a Radical Strategy
作者:Fusheng Li、Shuangjie Lin、Lei Shi、Xiyu Li
DOI:10.1055/s-0040-1706024
日期:2021.6
is of great appeal to the synthetic community as well as industrial applications. This study reports a conceptually new radical strategy for the photocatalytic generation of π-allyltitanium complexesfrombutadiene. This novel and environmentally benign strategy enables the direct three-component allylation of carbonyls with 1,3-butadiene and α-bromocarboxylates, providing rapid access to valuable homoallylic