129157-10-4Relevant academic research and scientific papers
Practical one-step synthesis of Koga's chiral bases
Curthbertson,O'Brien,Towers
, p. 693 - 695 (2001)
A simple, efficient and practical method for the preparation of Koga's chiral bases is described. The method involves attack of an amine on a styrene oxide-derived aziridinium ion and has allowed the synthesis of novel diamines which cannot be prepared us
Stereoselective reactions, 25. Enantioselective deprotonation of prochiral 4-substituted cyclohexanones by chiral chelated lithium amides
Shirai, Ryuichi,Sato, Daisaku,Aoki, Kazumasa,Tanaka, Masahide,Kawasaki, Hisashi,Koga, Kenji
, p. 5963 - 5972 (2007/10/03)
Enantioselective deprotonation of prochiral 4-substituted cyclohexanones (4a-d) by chiral chelated lithium amides (8a-k) in the presence of excess trimethylsilyl chloride was realized to give the corresponding chiral silyl enol ethers (6a-d) in up to 89% ee. It is shown that enantioselectivity of the reaction is dependent on the solvent used, but becomes almost independent on the solvent in the presence of HMPA. The sense of asymmetric induction can be correlated to the configuration at the chiral carbon bearing amide nitrogen of the lithium amide.
Stereoselective reactions. XXII. Design and synthesis of chiral chelated lithium amides for enantioselective reactions
Shirai,Aoki,Sato,Kim,Murakata,Yasukata,Koga
, p. 690 - 693 (2007/10/02)
Chiral chelated lithium amides ((R))-1a-g) were designed and synthesized in optically pure forms starting from (R)-phenylglycine.
ENANTIOSELECTIVE SYNTHESIS OF β-HYDROXY-α-METHYL CARBONYL COMPOUNDS BY ALDOL REACTION
Ando, Akira,Shioiri, Takayuki
, p. 4969 - 4988 (2007/10/02)
The enantioselective aldol reactions of ketone lithium enolates with aldehydes mediated chiral lithium amides were extensively investigated.The chiral amino ethers 4a-4l and diamines 16a,b were prepared from α-amino acids.The reaction conditions and the s
