Asymmetric Synthesis of <i>anti-</i>Aldol Segments via a Nonaldol Route: Synthetic Applications to Statines and (−)-Tetrahydrolipstatin
作者:Arun K. Ghosh、Khriesto Shurrush、Sarang Kulkarni
DOI:10.1021/jo900642f
日期:2009.6.19
An asymmetricsynthesis of anti-aldol segments via a nonaldol route is described. The strategy involves a highly diastereoselectivesynthesis of functionalized tetrahydrofuran derivatives from opticallyactive 4-phenylbutyrolactone. Treatment of the tetrahydrofuran derivatives with a Lewis acid and acetic anhydride provided the corresponding ring-opened styrene derivatives. Oxidative cleavage of the
Enantioselective Synthesis of (+)-Cryptophycin 52 (LY355703), a Potent Antimitotic Antitumor Agent
作者:Arun K. Ghosh、Lisa Swanson
DOI:10.1021/jo035077v
日期:2003.12.1
enantioselective and convergentsynthesis of cryptophycin 52 (2), an exceedingly potent cytotoxic agent, is described. Cryptophycin 52, a synthetic variant of the cryptophycin family, is currently undergoing clinical trials. The synthesis is convergent and involves assembly of three fragments, phenyl hexenal 3, d-tyrosine phosphonate 4, and protected beta-amino acid derivative 5. The synthesis of fragment 3
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