presence of catalytic amounts of Ni(acac)2 (5–10 mmol %) leading to arylzinc derivatives 1. The reaction can be extended to the preparation of alkylzinc compounds and allows a stereoselective cyclization to a 2,4-disubstituted tetrahydrofuran by a radical ring closure of an unsaturated telluride.
Visible-light-induced intramolecular sp<sup>3</sup> C–H oxidation of 2-alkyl-substituted benzamides for the synthesis of functionalized iminoisobenzofurans
作者:Lingang Wu、Yanan Hao、Yuxiu Liu、Qingmin Wang
DOI:10.1039/c9cc07791j
日期:——
developed a protocol for the synthesis of functionalized iminoisobenzofurans by means of visible-light-induced intramolecularcyclizationreactions of 2-alkyl-substituted benzamides. This one step-economical protocol, which involvesintramolecular sp3 C–O bond formation, features mild reaction conditions, exclusive chemoselectivity, and high yields.
Aromatic carboxamides and 2-phenylpyridine derivatives can be ortho-alkylated with Grignard reagents in the presence of a cobalt catalyst and DMPU as a ligand. The reaction proceeds smoothly at room temperature, using air as the sole oxidant. The dialkylated product is selectively obtained when N-methylcarboxamide is employed as a substrate, whereas N-phenyl- or N-isopropylcarboxamide preferentially
A new N-iodosuccinimide-mediated intramolecularoxidation to construct C−O bonds has been developed. The reaction differs in the construction of the C−N bond from the classic and modified Hofmann-Löffler-Freytag reactions.
已经开发出一种新的N-碘代琥珀酰亚胺介导的分子内氧化来构建 CO 键。该反应与经典和改进的 Hofmann-Löffler-Freytag 反应的 C-N 键结构不同。