Synthesis of δ-lactones from 2-alkynyl epoxides and 4-alkynyl-1,3-dioxolan-2-ones by palladium catalysed carbonylation and conjugate nucleophilic addition
Efficient silylation reactions of propargyl epoxides catalyzed by copper catalyst have been developed. Under mild reaction conditions, the tri- and tetrasubstituted functionalized allenols and alkenes could be selectively obtained in moderate to high yields via tuning the bases and solvents used in the reactions. This work provides straightforward and efficient approaches to the synthesis of multifunctionalized
Synthesis of δ-lactones from 2-alkynyl epoxides and 4-alkynyl-1,3-dioxolan-2-ones by palladium catalysed carbonylation and conjugate nucleophilic addition
作者:Julian G. Knight、Simon W. Ainge、Carl A. Baxter、Timothy P. Eastman、Simon J. Harwood
DOI:10.1039/b006927m
日期:——
Palladium catalysed carbonylation of both 4-alkynyl-1,3-dioxolan-2-ones and alkynyl epoxides occurs under mild conditions to give methyl 5-hydroxy-2,3-dienoates which are converted to γ,δ-unsaturated δ-lactones by tandem conjugate additionâcyclisation with lithium dimethylcuprate or to methyl (E)-5-hydroxypent-3-enoates by stereoselective reduction with sodium borohydride.