1]octane-carboxylic acids belonging to 7-endo-BTAa sub-class of γ/δ aminoacids is described. The novelty is the use of 2,3-O-isopropylidene-erythrose instead of meso-tartaric acid derivative, thus allowing us to perform an enantiospecific synthesis. Reductiveamination of erythrolactol with aminoacetaldehyde diethylacetal or benzylamine, and subsequent acid cyclisation gave directly the amino alcohol scaffold
Enantioselective addition of diethylzinc to aldehydes using 1,4-aminoalcohols as chiral ligands
作者:Dina Scarpi、Fabrizio Lo Galbo、Ernesto G. Occhiato、Antonio Guarna
DOI:10.1016/j.tetasy.2004.03.004
日期:2004.4
constrained, optically active 1,4-aminoalcohols have been used as chiral ligands in the addition of diethylzinc to aromatic aldehydes. The enantioselectivity was strongly influenced by the N-alkyl group: the best results were achieved with N-ethyl- and N-benzyl-aminoalcohols (ees up to 95% and 81%, respectively). One example of addition to an aliphatic aldehyde is also reported (best ee 61%).