N-α-Oxopropionyl-(S)-prolin-methylester;Pyruvamid d. L-Prolin-methylesters;N-Pyruvoyl-L-prolin-methylester;(S)-Methyl 1-(2-oxopropanoyl)pyrrolidine-2-carboxylate;methyl (2S)-1-(2-oxopropanoyl)pyrrolidine-2-carboxylate
Diastereoselective asymmetric allylation of chiral α-keto-amides with allyltrimethylsilane. Preparation of protected homoallylic alcohols
作者:Kenso Soai、Miyuki Ishizaki
DOI:10.1039/c39840001016
日期:——
In the presence of Lewis acids, protectedhomoallylicalcohols of high diastereoisomeric excesses (up to 89%) were obtaine by he addition of allyltrimethylsilane to chrial α-keto-amides derived from (S)-proline esters.
Asymmetric catalytichydrogenations of the entitled compounds were carried out over palladium on charcoal in various solvents to afford N-[(S)-lactoyl]-(S)-proline esters with a d.e.(=diastereoisomeric excess) of up to 59%. The stereochemistry of the catalytichydrogenation was explained by the “chelation mechanism.” And the effects of temperature and bulkiness of the ester groups on the asymmetric