Synthesis of methyl 3-amino-2-hydroxy-4-phenylbutanoates, important core intermediates for peptide mimics possessing biological activities
摘要:
Core intermediates for the synthesis of anti-cancer agents, inhibitors of aminopeptidases and HIV proteases, 3-amino-2-hydroxy-4-phenylbutanoates were synthesized by using H-C(CN)(2)O-SiR3 as a key reagent. (C) 2001 Elsevier Science Ltd. All rights reserved.
The present application relates to novel bicyclic azaheterocycles, to processes for preparation thereof, to the use thereof, alone or in combinations, for treatment and/or prophylaxis of diseases and to the use thereof for production of medicaments for treatment and/or prophylaxis of diseases, especially for treatment and/or prophylaxis of cardiovascular disorders.
A synthetic methodology for the synthesis of α-aminoacidprecursors directly from the corresponding aldehydes using N,O-dialkylated hydroxylamines and masked acyl cyanide (MAC) reagents was developed. The one-pot reaction can be carried out under mild conditions and without a separate purification step of the imino species. The method was applied to the synthesis of optically pure (+)-4-methylphenylglycine
Synthesis of Malononitrile-Substituted Diarylmethines via
1,6-Addition of Masked Acyl Cyanides to para-Quinone Methides
作者:Dieter Enders、Kun Zhao、Ying Zhi、Ai Wang
DOI:10.1055/s-0036-1590947
日期:2018.2
utility of this protocol has been demonstrated in the synthesis of bioactive compounds. An efficient method for the synthesis of malononitrile-substituted diarylmethines through 1,6-conjugate addition of para-quinone methides with masked acyl cyanide (MAC) reagents has been developed. Under mild conditions, the scalable reaction occurs in good to excellent yields providing a straightforward access to
Synthesis of α-Amino Acid Derivatives and Peptides via Enantioselective Addition of Masked Acyl Cyanides to Imines
作者:Kin S. Yang、Viresh H. Rawal
DOI:10.1021/ja510135t
日期:2014.11.19
asymmetric synthesis of amino acid derivatives is reported. Masked acyl cyanide (MAC) reagents are shown to be effective umpolung synthons for enantioselectiveadditions to N-Boc-aldimines. The reactions are catalyzed by a modified cinchona alkaloid, which can function as a bifunctional, hydrogen bonding catalyst, and afford adducts in excellent yields (90–98%) and high enantioselectivities (up to 97
Squaramide-Catalyzed Enantioselective Michael Addition of Masked Acyl Cyanides to Substituted Enones
作者:Kin S. Yang、Antoinette E. Nibbs、Yunus E. Türkmen、Viresh H. Rawal
DOI:10.1021/ja409012q
日期:2013.10.30
Masked acyl cyanide (MAC) reagents are shown to be effective umpolung synthons for enantioselective Michaeladdition to substituted enones. The reactions are catalyzed by chiral squaramides and afford adducts in high yields (90–99%) and with excellent enantioselectivities (85–98%). The addition products are unmasked to produce dicyanohydrins that, upon treatment with a variety of nucleophiles, provide