Asymmetric trimethylsilylcyanation of aldehydes catalyzed by chiral salen TiIV complexes with theC 1 symmetry
摘要:
Asymmetric trimethylsilylcyanation of a number of aromatic and aliphatic aldehydes catalyzed by chiral Ti-IV complexes prepared in situ from Ti(OPri)(4) and (1S)-[N,N'-bis(2'-hydroxy-3'-tert-butylbenzylidene)]-1,2-diaminoalkanes gives products with (S)-absolute configurations.
Diastereo- and Enantioselective Synthesis of Vicinal Diamines via Aza-Michael Addition to Nitroalkenes
作者:Dieter Enders、Jürgen Wiedemann
DOI:10.1055/s-1996-4411
日期:1996.12
The asymmetric synthesis of protected 1,2-diamines 4 by aza-analogous Michael addition of (-)-(2S,3R,4R,5S)-1-amino-3,4-dimethoxy-2,5-bis(methoxymethyl)pyrrolidine (ADMP) to nitroalkenes 1 in good overall yields and high enantiomeric excesses (ee = 93-96%) is described. The auxiliary constitutes a novel chiral equivalent of ammonia and is removed under reductive N-N bond cleavage with Raney nickel, which also reduces the nitro group. The absolute configuration was determined by NMR-spectroscopic methods and polarimetry.
Asymmetric trimethylsilylcyanation of aldehydes catalyzed by chiral salen TiIV complexes with theC 1 symmetry
作者:Yu. N. Belokon、L. V. Yashkina、M. A. Moscalenko、A. A. Chesnokov、V. S. Kublitsky、N. S. Ikonnikov、S. A. Orlova、V. I. Tararov、M. North
DOI:10.1007/bf02503790
日期:1997.11
Asymmetric trimethylsilylcyanation of a number of aromatic and aliphatic aldehydes catalyzed by chiral Ti-IV complexes prepared in situ from Ti(OPri)(4) and (1S)-[N,N'-bis(2'-hydroxy-3'-tert-butylbenzylidene)]-1,2-diaminoalkanes gives products with (S)-absolute configurations.
[EN] 2-OXO-1-IMIDAZOLIDINYL IMIDAZOTHIADIAZOLE DERIVATIVES<br/>[FR] DÉRIVÉS DE 2-OXO-1-IMIDAZOLIDINYL IMIDAZOTHIADIAZOLE
申请人:UCB BIOPHARMA SPRL
公开号:WO2019011767A1
公开(公告)日:2019-01-17
The present invention relates to 2-oxo-1-imidazolidinyl imidazothiadiazole derivatives, processes for preparing them, pharmaceutical compositions containing them and their use as pharmaceuticals.