Diastereoselective Synthesis of an Isoprostane:<b> (</b>±)-8-<i>epi</i>-PGF<sub>2</sub><sub>α</sub> Ethyl Ester
作者:Douglass F. Taber、R. Jason Herr、D. Mark Gleave
DOI:10.1021/jo9616365
日期:1997.1.1
A total synthesis of the isoprostane (+/-)-8-epi-PGF(2)(alpha) ethyl ester (5) is described, based on the diastereoselective cyclization of alpha-diazo ketone 7. This ketone is assembled by aldol condensation between alpha-diazo ketone 8 and aldehyde 9. The sequential alpha-diazo ketone aldol/insertion described here offers a powerful new approach to cycloalkane construction.
Palladium-Catalyzed Enantioselective Redox-Relay Heck Alkynylation of Alkenols To Access Propargylic Stereocenters
作者:Zhi-Min Chen、Christine S. Nervig、Ryan J. DeLuca、Matthew S. Sigman
DOI:10.1002/anie.201703089
日期:2017.6.1
An enantioselective redox-relay Heck alkynylation of di- and trisubstituted alkenols to construct propargylic stereocenters is disclosed using a new pyridine oxazoline ligand. This strategy allows direct access to chiral β-alkynyl carbonyl compounds employing allylic alcohol substrates in contrast to more traditional conjugate addition methods.