New method for C–H arylation/alkylation at α-position of cyclic aliphatic ethers by iron-oxide mediated reaction
作者:Parvinder Pal Singh、Satish Gudup、Hariprasad Aruri、Umed Singh、Srinivas Ambala、Mahipal Yadav、Sanghapal D. Sawant、Ram A. Vishwakarma
DOI:10.1039/c1ob06660a
日期:——
We report a new and efficient iron oxide catalyzed cross-coupling reaction between organometallic species such as alkyl/arylmagnesium halides or organolithium species and α-hydrogen bearing cyclic unbranched and branched aliphatic ethers via activation of C(sp3)–H. In the presence of 1 mol% of iron oxide, five and six membered unbranched cyclic ethers such as tetrahydrofuran and tetrahydropyran gave
Catalytic dehydrogenative dual functionalization of ethers: dealkylation–oxidation–bromination accompanied by C–O bond cleavage via aerobic oxidation of bromide
A catalytic dehydrogenative dual functionalization (DDF) of ethers viaoxidation, dealkylation, and α-bromination by the aerobic oxidation of bromide was developed to obtain the corresponding α-bromo ketones in high yields. In particular, the reaction of substituted tetrahydrofurans as cyclic ethers provided 3,3-dibromo tetrahydrofuran-2-ols in high yields selectively through the double α-bromination
Iron oxide mediated direct C–H arylation/alkylation at α-position of cyclic aliphatic ethers
作者:Parvinder Pal Singh、Satish Gudup、Srinivas Ambala、Umed Singh、Sumit Dadhwal、Baldev Singh、Sanghapal D. Sawant、Ram A. Vishwakarma
DOI:10.1039/c1cc11094b
日期:——
reaction between organometallic species such as alkyl/arylmagnesium halides or organolithium species and alpha-hydrogen bearing cyclic aliphatic ethers via activation of C(sp(3))-H. This is the first example of iron oxide mediateddirect C-C bond formation without expensive or toxic ligands.