An enantioselective synthesis of the C3–C21 segment of the macrolide immunosuppressive agent FR252921
作者:Arun K. Ghosh、Samuel Rodriguez
DOI:10.1016/j.tetlet.2016.05.067
日期:2016.6
An enantioselective synthesis of the C3–C21 segment of the novel immunosuppressant FR252921 is described. The C12 and C13 stereogenic centers were constructed by a non-aldol process utilizing optically active 4-phenylbutyrolactone. The C18 stereogenic center was installed using Braun’s highly diastereoselective acetate aldolreaction. Other key steps involved Curtius rearrangement and Horner–Wadsworth–Emmons