We describe Cu-catalyzed intermolecular alkynylation and allylation of unactivated C(sp3)–H bonds with singly occupied molecular orbital-philes (SOMO-philes) via hydrogen atom transfer (HAT). Employing N-fluoro-sulfonamide as a HAT reagent, a set of substituted alkene and alkyne compounds were synthesized in high yields with good regioselectivity and functional-group compatibility. Late-stage functionalization
Palladium catalysed tetramolecular cascade processes incorporating allene and carbon monoxide
作者:Ronald Grigg、Stephen Brown、Visuvanathar Sridharan、Michael D. Uttley
DOI:10.1016/s0040-4039(97)01062-9
日期:1997.7
Chemo- and regio-specific palladiumcatalysed four component cascade processes, involving formation of 4 new bonds, initiated by oxidative addition of Pd(0) with aryl/heteroaryl iodides followed by sequential incorporation of CO(1 atm), allene (1 atm) and an S- or N- nucleophile[PhSO2- or (RNTs)] occur in good to excellent yield at 50°C.
A visible-light-induced radical gem-iodoallylation of CF3CHN2 was developed under mild conditions, delivering a variety of α-CF3-substituted homoallylic iodide compounds in moderate to excellent yields. The transformation features broad substrate scope, good functional group compatibility, and operational simplicity. The described protocol provides a convenient and attractive tool to apply CF3CHN2