General synthetic routes to β-hydroxy-acids from t-butyl esters and the Reformatskii reaction
作者:D. A. Cornforth、A. E. Opara、G. Read
DOI:10.1039/j39690002799
日期:——
modified Reformatskii procedure which leads directly to the hydroxy-acid. With highly hindered ketones or under conditions of inverse addition, self-condensation of the Reformatskii reagents from the t-butyl esters of α-bromopropionic acid and α-bromoisobutyric acid seriously reduce the yields of β-hydroxy-esters.
cis-Fused γ-lactones from simple precursors via β-lactone rearrangements
作者:T. Howard Black、Douglas C. Smith、Shane A. Eisenbeis、Karen A. Peterson、Mark S. Harmon
DOI:10.1039/b100261a
日期:——
cis-Fused bicyclic γ-lactones were prepared in a three step sequence, featuring the stereospecific rearrangement of spiro bicyclic β-lactones; the dependence of the β- to γ-lactone ring expansion on the relative stabilities of the intermediate carbocations was also investigated.