Eine Synthese von Vitamin A nach der Sulfonmethode
摘要:
A Synthesis of Vitamin A According to the Sulfone Method.Starting from β‐ionyl phenyl sulfone 7 and an appropriate allylic chloride 10 retinol 14 has been prepared by a direct procedure. Subsequent acetylation and isomerization led to crystalline all‐E‐vitamin A acetate 16.
The preparation of vicinal difluoroolefinic carbonyl compounds and their application to the synthesis of difluororetinal analogs
作者:A.E Asato、R.S.H Liu
DOI:10.1016/s0040-4039(00)84789-9
日期:1986.1
The preparation of a novel vicinal difluorinated retinal analog is described. The key difluoroolefinic intermediate in the synthesis was prepared by the reaction of DAST with ethyl acetoacetate.
A short step synthesis of cyclopentatrienylidene retinals [(9)-(11)] is reported and the formation of the novel rhodopsin analogue (12) from the isomer (9) is described.