Horner-Wadsworth-Emmons Reactions in THF: Effect of Hydroperoxide Species
作者:Ian Fairlamb、Amanda Jarvis、Elizabeth Wells
DOI:10.1055/s-0033-1339200
日期:——
Horner-Wadsworth-Emmons (HWE) reactions routinely employ tetrahydrofuran (THF) as the reaction solvent. In this paper we show that THF adducts (derived from THF-hydroperoxide species) of HWE phosphonate ester compounds are formed under microwave irradiation (i.e., under pressure), or in the presence of a reductant [e.g., P(OEt)(3)] in a conventionally heated reaction.
CuI complexes containing a multidentate and conformationally flexible dibenzylidene acetone ligand (dbathiophos): Application in catalytic alkene cyclopropanation
作者:Amanda G. Jarvis、Adrian C. Whitwood、Ian J. S. Fairlamb
DOI:10.1039/c0dt01612h
日期:——
showing that the ligand backbone of dbathiophos is hemilabile, and able to adopt different 1,4-dien-3-one conformational geometries around CuI. Complexes 4 and 6 both effectively catalyse the cyclopropanation of styrene with ethyl diazoacetate at low catalyst loadings (1 mol% Cu).