Catalysis mediated by ironcomplexes is emerging as an eco-friendly and inexpensive option in comparison to traditional metal catalysis. The epoxidation of alkenes constitutes an attractive application of iron(III) catalysis, in which terminal olefins are challenging substrates. Herein, we describe our study on the design of biomimetic non-heme ligands for the in situ generation of iron(III) complexes
6-beta(substituted)-(S)-hydroxymethylpenicillanic acids and derivatives
申请人:Pfizer Inc.
公开号:US04782050A1
公开(公告)日:1988-11-01
Antibacterial penicillins of the formula ##STR1## or a pharmaceutically acceptable salt thereof wherein R.sup.1 is a heterocyclic group and R is hydrogen, the residue of certian carboxy protecting groups or the residue of an ester group readily hydrolyzable in vivo having activity against resistant organisms.
Cobalt-Catalyzed Desymmetric Isomerization of Exocyclic Olefins
作者:Xufang Liu、Xianle Rong、Shihan Liu、Yu Lan、Qiang Liu
DOI:10.1021/jacs.1c11343
日期:2021.12.15
Chiral cyclic olefins, 1-methylcyclohexenes, are versatile building blocks for the synthesis of pharmaceuticals and natural products. Despite the prevalence of these structural motifs, the development of efficient synthetic methods remains an unmet challenge. Herein we report a novel desymmetric isomerization of exocyclicolefins using a series of newly designed chiral cobalt catalysts, which enables
enantioselective 1,2-reduction of α,β-unsaturated ketones has been achieved using a chiral pincer Mn catalyst. A series of PNN tridentate ligands containing benzimidazole groups were designed with ferrocene as the backbone, which coordinated with Mn to form the active catalyst. This mild process represents a general method to access chiralallyl alcohols with high catalytic activity (up to 9500 TON) and high enantioselectivity
Synthesis and cardiotonic activity of novel biimidazoles
作者:Donald P. Matthews、James R. McCarthy、Jeffrey P. Whitten、Philip R. Kastner、Charlotte L. Barney、Franklin N. Marshall、Marcia A. Ertel、Therese Burkhard、Philip J. Shea、Takashi Kariya
DOI:10.1021/jm00163a052
日期:1990.1
A series of substituted 2,2'-bi-1H-imidazoles and related analogues was synthesized and evaluated for inotropic activity. Structure-activity relationship studies based on a nonclassical bioisosteric approach indicated the necessity of a cyano group on one of the imidazole rings to obtain the desired pharmacological profile. 4(5)-Cyano-2,2'-bi-1H-imidazole (15a) was the most potent inotropic agent in
合成了一系列取代的2,2'-bi-1H-咪唑和相关类似物,并评估了其正性肌力。基于非经典生物等位线方法的结构活性关系研究表明,咪唑环之一上的氰基必须具有所需的药理特性。4(5)-Cyano-2,2'-bi-1H-咪唑(15a)是该系列中最有效的正性肌力药。在麻醉狗中,0.16 mg / kg iv时左心室dP / dt增加25%(ED25%= 0.16 mg / kg),在1 mg / kg iv时左心室收缩力增加60%。化合物15a是分离自犬心的IV型环状核苷酸磷酸二酯酶的良好抑制剂,具有与氨力农相似的效力。5'-cyano-2,4'-bi-1H-咪唑(44)和4-cyano-2,4' -bi-1H-咪唑(48)具有正性肌力活性。另外,两种可能的1,1'-二甲基氰基-2,2'-bi-1H-咪唑(24和25)是不活泼的,表明酸性NH和氰基对于正性肌力活性至关重要。