Stereoselective Synthesis of Allenyl Alcohols by Cobalt(III)‐Catalyzed Sequential C−H Bond Addition to 1,3‐Enynes and Aldehydes
作者:Chaofan Xu、Joseph P. Tassone、Brandon Q. Mercado、Jonathan A. Ellman
DOI:10.1002/anie.202202364
日期:2022.6.20
An efficient and stereoselective Co-catalyzed three-component synthesis of allenyl alcohols is reported. This method introduces two C−C σ bonds through C−H bond activation and sequential addition to 1,3-enynes and a wide range of aldehydes. A plausible mechanism and further transformations are disclosed.
New pyrazolyl and thienyl aminohydantoins as potent BACE1 inhibitors: Exploring the S2′ region
作者:Michael S. Malamas、Jim Erdei、Iwan Gunawan、Keith Barnes、Yu Hui、Matthew Johnson、Albert Robichaud、Ping Zhou、Yinfa Yan、William Solvibile、Jim Turner、Kristi Yi Fan、Rajiv Chopra、Jonathan Bard、Menelas N. Pangalos
DOI:10.1016/j.bmcl.2011.07.057
日期:2011.9
The proteolytic enzyme beta-secretase (BACE1) plays a central role in the synthesis of the pathogenic beta-amyloid in Alzheimer's disease. SAR studies of the S2' region of the BACE1 ligand binding pocket with pyrazolyl and thienyl P2' side chains are reported. These analogs exhibit low nanomolar potency for BACE1, and demonstrate >50-to 100-fold selectivity for the structurally related aspartyl proteases BACE2 and cathepsin D. Small groups attached at the nitrogen of the P2' pyrazolyl moiety, together with the P3 pyrimidine nucleus projecting into the S3 region of the binding pocket, are critical components to ligand's potency and selectivity. P2' thiophene side chain analogs are highly potent BACE1 inhibitors with excellent selectivity against cathepsin D, but only modest selectivity against BACE2. The cell-based activity of these new analogs tracked well with their increased molecular binding with EC50 values of 0.07-0.2 mu M in the ELISA assay for the most potent analogs. (C) 2011 Elsevier Ltd. All rights reserved.
RUSSAVSKAYA, N. V., 3 KONF. MOL. UCHENYX XIM. TEXNOL. FAK. RPI, RIGA,(1989) S. 34
作者:RUSSAVSKAYA, N. V.
DOI:——
日期:——
US4523942A
申请人:——
公开号:US4523942A
公开(公告)日:1985-06-18
Nickel-Catalyzed Direct Alkylation of C–H Bonds in Benzamides and Acrylamides with Functionalized Alkyl Halides via Bidentate-Chelation Assistance
作者:Yoshinori Aihara、Naoto Chatani
DOI:10.1021/ja401344e
日期:2013.4.10
The alkylation of the ortho C-H bonds in benzamides and acrylamides containing an 8-aminoquinoline moiety as a bidentate directing group with unactivated alkylhalides using nickel complexes as catalysts is described. The reaction shows high functional group compatibility. In reactions of meta-substituted aromatic amides, the reaction proceeds in a highly selective manner at the less hindered C-H bond