Directed metallations of 4-ethylidenetetronic acid and its derivatives as a synthetic entry to natural 4-oxy-2-furanones
作者:Nicholas G. Clemo、Gerald Pattenden
DOI:10.1016/s0040-4039(00)86896-3
日期:1982.1
(LDA) removes the α-proton from the O-methyl tetronic acid (2) leading to the vinylic carbanion (12), whereas treatment of the trimethylsilyl derivative (14) with LDA, followed by reaction with aldehydes gives products resulting from both γ− and ε-addition; the directedmetallations provide access to a range of 4-oxy-2-furanone derivatives found amongst natural products.