HUCKSTEP M. R.; TAYLOR R. J. K.; CATON M. P. L., TETRAHEDRON LETT., 27,(1986) N 49, 5919-5922
作者:HUCKSTEP M. R.、 TAYLOR R. J. K.、 CATON M. P. L.
DOI:——
日期:——
Seleno- and sulpheno-lactonisation reactions of 5,7-dienoic acids
作者:Michael R Huckstep、Richard J.K Taylor、Michael P.L Caton
DOI:10.1016/s0040-4039(00)85362-9
日期:1986.1
The seleno- and sulpheno-lactonisation reactions of 5,7-octadienoic acid (1) and 5,7-nonadienoic acid (2) have been studied as a means of preparing functionalised lactones; δ-lactone formation occurs in all cases but whereas octadienoic acid (1) undergoes only 1,4-addition across the diene unit the outcome of the corresponding reactions of nonadienoic acid (2) depends on the choice of the electrophilic
and low E factor. This success can be ascribed to the higher reactivity of allylic alcohols as compared with the allyl ester products in soft Ru/hard Brønstead acid combined catalysis, which can function under slightly acidic conditions unlike the traditional Pd-catalyzed system. Detailed analysis of the stereochemical outcome of the reaction using an enantiomerically enriched D-labeled substrate