摘要 已经开发出一种简单的反应路线,该路线指向带有α-氨基酸和苯并[ d ]咪唑侧基的手性伯胺。在四个步骤的合成中,将六个起始必需α-氨基酸转化为目标手性胺。在4-硝基苯甲醛或靛红与丙酮或环己酮之间的直接不对称醛醇缩合反应中,将制备的胺筛选为有机催化剂。以良好的化学收率,高达97:3的非对映选择性(与环己酮的反应)和高达71%ee的对映选择性获得醛醇加合物。三氟乙酸和苯甲酸被证明是分别在4-硝基苯甲醛和靛红上进行羟醛合成的最佳助催化剂。 已经开发出一种简单的反应路线,该路线指向带有α-氨基酸和苯并[ d ]咪唑侧基的手性伯胺。在四个步骤的合成中,将六个起始必需α-氨基酸转化为目标手性胺。在4-硝基苯甲醛或靛红与丙酮或环己酮之间的直接不对称醛醇缩合反应中,将制备的胺筛选为有机催化剂。以良好的化学收率,高达97:3的非对映选择性(与环己酮的反应)和高达71%ee的对映选择性获得醛醇加合物。三氟
An efficient one-pot conversion of carboxylic acids into benzimidazoles <i>via</i> an HBTU-promoted methodology
作者:Leonard Barasa、Sabesan Yoganathan
DOI:10.1039/c8ra07773h
日期:——
Benzimidazole is a privileged, and routinely used pharmacophore in the drug discovery process. Herein, we report a mild, acid-free and one-potsynthesis of indole, alkyl and alpha-amino benzimidazoles through a novel HBTU-promoted methodology. An extensive library of indole-carboxylic acids, alkyl carboxylic acids and N-protected alpha-amino acids has been converted into the corresponding benzimidazoles
Benzo[d]imidazole and Aliphatic α-Amino Acid Derived Primary Amines in Asymmetric Aldol Reactions
作者:Filip Bureš、Pravinkumar Mohite、Pavel Drabina
DOI:10.1055/s-0033-1340598
日期:——
ted primaryamines were synthesized. The reaction sequence involves activation of the Boc-amino acid carboxylic acid, reaction with o -phenylenediamine, and subsequent cyclization to benzo[ d ]imidazole. N-Methylation and final Boc group removal afforded four new primaryamines. The synthesized amines were preliminarily applied as organocatalysts in an asymmetric version of the aldol reaction between
Influence of the Side Chain Next to C-Terminal Benzimidazole in Opioid Pseudopeptides Containing the Dmt-Tic Pharmacophore
作者:Gianfranco Balboni、Claudio Trapella、Yusuke Sasaki、Akihiro Ambo、Ewa D. Marczak、Lawrence H. Lazarus、Severo Salvadori
DOI:10.1021/jm900686q
日期:2009.9.10
To improve the structure-activity studies of the lead 6 opioid agonist H-Dmt-Tic-Asp*-Bid, we synthesized and pharmacologically characterized a series of analogues in which the side chain next to 1H-benzimidazole-2-yl (Bid) was substituted by those endowed with different chemical properties. Interesting results were obtained: (1) only Gly, Ala, and Asp resulted in delta agonism, (2) Phe yielded delta antagonism, (3) and all other residues except Glu (devoid of any activity) gave mu agonism.