Reaction of active methylene compounds with aromatic aldehydes in the presence of chlorotrimethylsilane–sodium iodide–acetonitrile reagent gave C-arylmethylated products, the reduced condensation products, although the reaction either with aliphatic primary aldehydes or with isobutyraldehyde afforded alkylidenation products or dihydrofurans.
ligands catalyze together the decomposition of α-diazocarbonyl compounds leading to O−H insertion and condensation reactions. In comparison with Rh(II) and Cu(I) complexes, the CpRu catalysts produce rapid and often more selective reactions. Promising enantioselectivities are obtained in dioxole syntheses.
Lactone, 3. Mitt.1) Zur Synthese von α-Aminoalkyl-γ-lactonen
作者:Jochen Lehmann、Thomas Reusch
DOI:10.1002/ardp.19833161110
日期:——
Die Alkylierung von α‐Acetyl‐γ‐lactonen mit ω‐Aminoethyl‐ und propylchloriden, gefolgt von einer in situ Abspaltung des Acetylrestes mit überschüssigem Ethanolat stellt einen allgemeinen Syntheseweg zur Darstellung von α‐Aminoethyl‐ und α‐Aminopropyl‐γ‐lactonen dar. Die Ausbeuten werden durch Nebenreaktionen begrenzt.