α-alkylation of serine with self-reproduction of the center of chirality
作者:Dieter Seebach、Johannes D. Aebi
DOI:10.1016/s0040-4039(01)81227-2
日期:1984.1
The lithiumenolate 6 of methyl (2R,4S)-2--butyl-3-formyl-oxazolidine-4-carboxylate (4b) derived from (s)-(+)-serine can be generated with LDA in THF solution at −75°C. Alkylations (→ 9) and hydroxyalkylations (→ 10, 11) occur preferentially (>95:5) from the Re-face of the donor center (relative topicity lk). This stereochemical course is derived from the absolute configuration of 2-deuterio- and 2-methyl-serine