A practical synthetic route to enantiopure 5-substituted cis-decahydroquinolines has been developed, the key steps being a stereoselective cyclocondensation of 2-substituted 6-oxocyclohexenepropionates 2 with (R)-phenylglycinol, the stereoselective hydrogenation of the resulting unsaturated tricyclic lactams, and the stereoselective reductive cleavage of the oxazolidine ring.
A concise synthesis of the marine alkaloids (â)-lepadins AâC from a phenylglycinol-derived tricyclic lactam is reported. Key steps from the stereochemical standpoint involve stereoselective cyclocondensation, double bond hydrogenation, oxazolidine opening, hydroborationâoxidation, and HornerâWadsworthâEmmons reactions.
Removal of the Chiral Inductor from Phenylglycinol-derived Tricyclic Lactams. Unexpected Generation of Chiral trans-Hydrochromene Lactones
作者:Rosa Griera、Alexandre Pinto、Robert Fabregat、Eric Cots、Joan Bosch、Mercedes Amat
DOI:10.2174/1570178615666171213143657
日期:2018.4.12
In the search for synthetic routes for the preparation of cis- and trans- decahydroquinolin-2-
ones, a procedure for the generation of enantiopure trans-hydrochromene lactones, by treatment of (R)-
phenylglycinol-derived oxazoloquinolone lactams with Na/liq. NH3 followed by acidification, has been
developed.