140134-20-9Relevant articles and documents
Synthesis of C2 symmetric primary vicinal diamines. Double stereospecific Mitsunobu reaction of the heterocyclic diols derived from tartaric acid
Skarzewski, Jacek,Gupta, Anil
, p. 1861 - 1867 (1997)
Homochiral 1-alkyl-3,4-dihydroxypyrrolidines, (S,S)- and (R,R)-5 were obtained by cyclization and reduction of both enantiomers of (+)- and (-)-tartaric acid, respectively. Also (S,S)-3,4-dihydroxytetrahydrofurane 6 was prepared from (+)-diethyl tartrate. All these heterocyclic vic-diols underwent twofold Mitsunobu reaction (Ph3P/DEA/HN3) followed by catalytic hydrogenation forming stereospecifically the corresponding primary vicinal diamines (R,R)-, (S,S)-2 and (R,R)-3. The absolute configuration of diamines 2, 3 was established by the exciton-coupling CD spectra of their N,N'-diphthaloyl derivatives.
Enantioselective trimethylsilylcyanation of benzaldehyde using pyrrolidine-based chiral salen ligands
Serra, M. Elisa Silva,Murtinho, Dina,Goth, Albertino
scheme or table, p. 64 - 69 (2010/08/07)
The in situ formed Ti(IV) complexes of several pyrrolidine-based chiral salen ligands derived from natural (L)-tartaric acid were evaluated as catalysts in the enantioselective trimethylsilylcyanation of benzaldehyde. The catalysts were found to be very active, producing the corresponding product, O-trimethylsilylmandelonitrile, in high yields (>94%) and enantioselectivities of up to 88%.
Asymmetric addition of diethylzinc to ketones promoted by tartaric acid derivatives
Hui, Ailing,Zhang, Jintang,Wang, Zhiyong
, p. 2374 - 2384 (2008/09/21)
The preparation of new sulfonamide ligands derived from L-tartaric acid and camphor sulfonyl chloride are described. The employment in the titanium tetraisopropoxide-promoted enantioselective addition of diethylzinc to ketones has been studied. The best enantiomeric excess is up to 99% with 7 mol% catalyst loading at room temperature. Copyright Taylor & Francis Group, LLC.