一些基于(苯并[ d ]噻唑-2-基)-1-苯基甲胺衍生物的新型抑制剂被设计用于减少阿尔茨海默病的聚集过程。这些结构似乎模仿了二苯乙烯样支架,而苯并噻唑部分“锁定”了硫黄素 T 结合位点。其他抑制剂是基于2-((苯并[ d ]噻唑-2-基亚氨基)甲基)-5-(苄氧基)-1-甲基吡啶-4(H)-酮衍生物设计的。
Enantioselective Synthesis of β-Amino Esters Bearing a Benzothiazole Moiety via a Mannich-Type Reaction Catalyzed by a Cinchona Alkaloid Derivative
作者:Liang Li、Bao-An Song、Pinaki S. Bhadury、Yu-Ping Zhang、De-Yu Hu、Song Yang
DOI:10.1002/ejoc.201100351
日期:2011.7.18
Novel β-amino esters bearing a bioactive benzothiazole moiety were obtained with high enantioselectivities (up to 95 % ee) through a Mannich-type reaction of different imines with malonate in the presence of a new chiral cinchona alkaloid thiourea catalyst. Imines derived from both aromatic and heterocyclic aldehydes were found useful in this conversion.
Asymmetric Synthesis of α-Amino Phosphonates by Using Cinchona Alkaloid-Based Chiral Phase Transfer Catalyst
作者:Weihua Li、Yifeng Wang、Danqian Xu
DOI:10.1002/ejoc.201801013
日期:2018.10.24
imines catalyzed by a cinchona alkaloid‐based chiralphase‐transfercatalyst has been developed. The process affords the desired hydrophosphonylation of imine products with quaternary stereocenters in good to high yields (up to 95 % yield) and excellent enantioselectivities (up to 99 % ee). And this straightforward protocol can be applied to gram scale reaction effectively.
Squaramide-catalysed enantionselective Mannich reaction of imines bearing a heterocycle with malonates
作者:Hai-Xiao He、Da-Ming Du
DOI:10.1039/c3ra43260b
日期:——
An efficient enantioselective Mannich reaction of iminesbearing a heterocycle with malonates catalysed by a cinchona-based squaramide organocatalyst has been developed. This catalytic asymmetric reaction afforded the β-amino ester derivatives containing a heterocycle moiety in high yields (up to 99%) and excellent enantioselectivities (up to 98%) in most cases. The imines with an electron-withdrawing
Synthesis and Characterization of Some 2-Azetidinones and Unexpected Azet-2(1H)-ones
作者:Handan Can Sakarya、Merve Yandımoğlu
DOI:10.5562/cca3386
日期:——
2-Azetidinone (2b-e) and some unexpected azet-2(1H)-one derivatives (3b-f) were synthesized in two steps from the substitution of 2-aminobenzothiazole and different substituted aromatic aldehydes. Firstly, the Schiff bases were prepared via reaction of different 2-aminobenzothiazoles with different aromatic aldehydes. Second step was the formation of corresponding 2-azetidinone and some unexpected azet-2(1H)-one analogues by cyclocondensation of the Schiff bases with chloroacetyl chloride and phenoxy acetyl chloride in the presence of triethylamine. The chemical structures of the newly synthesized compounds were confirmed by FTIR, H-1 NMR, C-13 NMR, HMQC, elemental analysis and mass spectroscopic analysis.