Efficient Synthesis of New 4-Arylideneimidazolin-5-ones Related to the GFP Chromophore by 2+3 Cyclocondensation of Arylideneimines with Imidate Ylides
作者:Janusz Kowalik、Anthony Baldridge、Laren Tolbert
DOI:10.1055/s-0029-1218796
日期:2010.7
A 2+3 condensation of a wide assortment of Schiff bases, prepared from aromatic aldehydes and primary amines, with methyl 2-(1-ethoxyethylideneamino)acetate allows convenient access to an extensive family of substituted 4-arylideneimidazolin-5-one analogues of the green fluorescent protein (GFP) chromophore. 4-arylideneimidazolin-5-one - azomethine ylide - Schiff bases - heterocycle - 2+3 cycloaddition
A Novel Construction of 2-Benzazepine Scaffold Based on TiCl4-Mediated Tandem Mannich ReactionâAromatic Electrophilic Substitution
作者:Liangxi Li、Zhiming Li、Quanrui Wang
DOI:10.1002/hlca.200900107
日期:2009.12
A novelconstruction of 2‐benzazepine derivatives based on TiCl4‐mediated tandemMannich reaction of electron‐rich benzyl iminium ions with alkenyl ethers and Friedel–Crafts‐type alkylation is described. The protocol is amenable to provide the tricyclic furo[3,2‐d][2]benzazepine and pyrano[3,2‐d][2]benzazepine derivatives, respectively, with 2,3‐dihydrofuran or 3,4‐dihydro‐2H‐pyran as the substrates
描述了一种基于TiCl 4介导的富电子苄基亚胺离子与链烯基醚和Friedel – Crafts型烷基化的串联曼尼希反应的新型2-苯并ze庚因衍生物的结构。该协议适用于分别为三环呋喃[3,2- d ] [2]苯并and庚因和吡喃并[3,2- d ] [2]苯并ze庚因衍生物提供2,3-二氢呋喃或3,4-二氢呋喃。 2 H-吡喃为底物。
Cholinesterase inhibitors: SAR and enzyme inhibitory activity of 3-[ω-(benzylmethylamino)alkoxy]xanthen-9-ones
In this work, we further investigated a previously introduced class of cholinesterase inhibitors. The removal of the carbarnic function from the lead compound xanthostigmine led to a reversible cholinesterase inhibitors 3. Some new 3-[omega-(benzylmethylamino)alkoxy]xanthen-9-one analogs were designed, synthesized, and evaluated for their inhibitory activity against both acetylcholinesterase (AChE) and butyrylcholinesterase (BuChE). The length of the alkoxy chain of compound 3 was increased and different substituents were introduced. From the IC50 values, it clearly appears that the carbamic residue is crucial to obtain highly potent AChE inhibitors. On the other hand, peculiarity of these compounds is the high selectivity toward BuChE with respect to AChE, being compound 12 the most selective one (6000-fold). The development of selective BuChE inhibitors may be of great interest to clarify the physiological role of this enzyme and to provide novel therapeutics for various diseases. (c) 2006 Elsevier Ltd. All rights reserved.
Analgesics. II.<sup>1</sup> The Grignard Reaction with Schiff Bases<sup>2</sup>
作者:Robert Bruce Moffett、Willard M. Hoehn
DOI:10.1021/ja01199a061
日期:1947.7
Ito,I. et al., Chemical and pharmaceutical bulletin, 1969, vol. 17, # 7, p. 1524 - 1526