Enantioselective synthesis of (2S,3S)- and (2R,3R)-pyrrolidine-2,3-dicarboxylic acids: Conformationally constrained (S)- and (R)-aspartic acid analogues
were prepared from the key intermediate 2 and its enantiomer at C2, derived from chiral synthons 1- (R) and 1- (S), respectively, by ethoxycarbonylation, desulfonylation and conversion to carboxylic acid.
A versatile method for the synthesis of (S)- or (R)-cycloalkylglycines, (S)- or (R)-N-Heterocyclic and α,β-unsaturated N-heterocyclic α-amino acids
作者:Régine Pauly、N.André Sasaki、Pierre Potier
DOI:10.1016/s0040-4039(00)76520-8
日期:1994.1
α-amino acids, cycloalkylglycines and N-heterocyclic α-amino acids, were prepared in optically pure form from the same chiral synthon 1-(R) (or 1-(S)) simply by altering the quantity or type of base required for anion formation. Elaboration of the heterocyclic intermediate 3 provided α,β-unsaturated N-heterocyclic α-amino acids.
A novel method for chirospecific synthesis of 2,5-disubstituted pyrrolidines
作者:N. André Sasaki、Isabelle Sagnard
DOI:10.1016/s0040-4020(01)85236-4
日期:1994.1
One-pot ring formation using (R)-1 or (S)-1 as a nucleophile and homochiral glycidyl triflate (R)-2 or (S)-2 as an electrophile a pivotal intermediate 4 which can be transformed into a 2,5-disubstituted pyrrolidine with any desired stereochemistry at the C-2 and C-5 positions.
Stereoselective synthesis of optically pure β,γ-unsaturated α-amino acids in both L and D configurations
作者:N.André Sasaki、Chiyomi Hashimoto、Régine Pauly
DOI:10.1016/s0040-4039(00)99620-5
日期:1989.1
A new method for the stereoselectivesynthesis of opticallypure β,γ-unsaturated α-amino acids in L or D configuration is developed by reacting the dilithiate of (2R)-2-Bocamino-3-phenylsulfonyl-1-(2-tetrahydropyranyloxy)propane 1 or its (2S)-antipode 2, both derived from L-serine, with aldehyde, followed by stereoselective olefin formation, desulfonylation and oxidation.