218933-95-0Relevant articles and documents
Diastereo- and enantioselective syntheses of C2-symmetric 1,n-diamines by nucleophilic addition to dialdehyde-SAMP-hydrazones
Enders, Dieter,Meiers, Michaela
, p. 2542 - 2560 (2007/10/03)
Different protected C2-symmetric 1,n-diamines (R,R)- or (S,S)-4 and 8 can be prepared in high diastereo- and enantiomeric purity by nucleophilic 1,2-addition of organocerium reagents to the CN double bond of bis-SAMP-hydrazones (S,S)-2a-c. The chiral starting materials are readily available by reaction of dialdehydes with the enantiopure hydrazine 1-amino-2-methoxymethylpyrrolidine (SAMP). Reductive NN bond cleavage of the hydrazines (R,R,S,S)- or (S,S,S,S)-3 and 7 afforded the title compounds (de 72-98%, ee 96-98%). The novel entry for the asymmetric synthesis of N-protected C2-symmetric diamines presented here is highly flexible, as both the distance of the amino functions and the introduced residues R can be varied.