SEEBACH, D.;NAEF, R.;CALDERARI, G., TETRAHEDRON, 1984, 40, N 8, 1313-1324
作者:SEEBACH, D.、NAEF, R.、CALDERARI, G.
DOI:——
日期:——
(α-Alkylation of α-heterosubstituted carboxylic acids without racemization
作者:Dieter Seebach、Reto Naef、Giorgio Calderari
DOI:10.1016/s0040-4020(01)82417-0
日期:1984.1
α-Hydroxy- and α-mercapto-carboxylic acids are condensed with pivalaldehyde to give 2-t-butyl-5-substituted-l,3-dioxolanones or 1,3-oxathiolanones (2); the predominate CK-isomers are separated by crystallization. The cis-disubstituted heterocycles 2 derived from lactic, mandelic and malic acid furnish, after deprotonation with LDA, reaction with electrophiles such as alkyl halides, aldehydes and ketones