Various 1,4‐diols are easily accessible from alkenes through iron‐catalyzed aerobic hydration. The reaction system consists of a user‐friendly iron phthalocyanine complex, sodium borohydride, and molecular oxygen. Furthermore, the effect of additional ligands on the iron complex was examined for a model reaction. The second hydroxy group is installed by direct C(sp3)H oxygenation, which is based on
Reaction of Ethyl α-Chloro-α-phenylselenoacetate with Alkenes: Synthesis of α-Phenylseleno-γ-Butyrolactones
作者:Claudio C. Silveira、Marcelo A. Araujo、Eder J. Lenardão、Antonio L. Braga、Miguel J. Dabdoub
DOI:10.1055/s-1995-4101
日期:1995.10
Ethyl α-chloro-α-phenylselenoacetate (1) reacts with alk-1-enes in the presence of TiCl4 to give the corresponding α-phenylseleno γ,δ-unsaturated esters. Reaction of 1 with di- and trisubstituted alkenes and SnCl4 as a Lewis acid affords γ-butyrolactones directly and a minor amount of the γ,δ-unsaturated esters. These esters were converted into γ-butyrolactones on hydrolysis and reaction with electrophiles.
induced three-component reaction of difluoroalkyl halides, unactivatedalkenes, and alkynyl sulfones is described, providing a direct and general approach to the construction of synthetically valuable β-difluoroalkylated alkynes under room temperature conditions. This represents the first intermolecular alkynyl-difluoroalkylation of unactivatedalkenes.