Radiosynthesis of [tetrazoyl-11C]irbesartan, a non-peptidic angiotensin II antagonist
摘要:
With the aim of visualizing myocardial angiotensin II receptors (AT1 subtypes), [tetrazoyl-C-11]2-n-butyl-1-[(2'-(1H-tetrazol-5-yl)-1,1'-biphenyl-4-yl)methyl]-4-spirocyclo-pentane-2-imidazoline-5-one ([tetrazoyl-C-11]irbesartan (SR47436/BMS-186295)) 11 was synthesized in one pot in four steps from [C-11]hydrogen cyanide. The labelling process which yielded [tetrazoyl-C-11]irbesartan is described in detail and could be applied to the labelling of other ligands which possess the (1H-tetrazol-5-yl) moiety. Positron emission tomography (PET) studies were performed in dogs. Heart, lung and blood time-activity curves did not change. Therefore this new radioligand is not suitable for studying myocardial angiotensin II receptors with PET.
使用 KO t Bu/1,10-菲咯啉采用热或光化学控制工艺建立了多环芳香二芳基胺和咔唑的化学发散合成方法。合成过程涉及9-氨基-10-(氧膦基)菲的脱氧膦基化,这是通过区域选择性钯催化的氧膦基胺与2-碘联苯的直接[4 + 2]苯环化反应获得的。当在加热条件(~100℃)下进行脱氧膦化时,会产生9-氨基菲。然而,当反应在紫光(LED,λ max = 约 390 nm)照射下进行时,KO t Bu/1,10-菲咯啉促进单电子转移触发的脱氧膦化,然后环化,产生相应的π-膨胀咔唑。我们通过双脱氧膦环化成功合成了高度π扩容的二咔唑。此外,我们还介绍了通过脱膦酰化过程产生的一系列氨基化合物的光学性质。
Copper-Mediated Cyanation of Aryl Halides by Activation of Benzyl Cyanide as the Cyanide Source
作者:Qiaodong Wen、Jisong Jin、Yuncai Mei、Ping Lu、Yanguang Wang
DOI:10.1002/ejoc.201300052
日期:2013.7
Aryl nitriles were efficiently synthesized through copper-mediated cyanation of aryl halides using benzyl cyanide as the cyanide source. Aryl halides with various substituents on the aromatic ring afforded the corresponding aryl nitriles in 32–97 % yields (25 examples). This reaction could also be carried on a gram scale by using commercially available reagents. Additionally, a C–H bond oxidation and
carbonylation reaction for the synthesis of fluoren‐9‐ones from 2‐halogenated biphenyls using phenyl formate as a carbon monoxide surrogate was achieved. The combined use of cesium carbonate and o‐anisic acid resulted in a remarkable rate enhancement, where the reaction was complete within 3 min in some cases. Mechanistic studies indicated that the turnover‐limiting step of the reaction was the C−H bond‐cleaving
Reversal Diastereoselectivity Between the Organomagnesium and Organolithium Reagents on Chiral <i>N</i>-<i>Tert</i>-Butylsulfinylaldimines for the Preparation of Chiral Amines
作者:Chinnapillai Rajendiran、Periyandi Nagarajan、A. Naidu、P. K. Dubey
DOI:10.1080/00397911.2014.909487
日期:2014.10.18
Abstract The asymmetric synthesis of both the enantiomer of chiral amines from the single chiral source of N-tert-butylsulfinylaldimines (3) by simply changing the organometallic reagents through diastereoselective addition. An efficient enantioselective synthesis of chiral amines including (S)-3-methyl-1-(2-piperidin-1-yl-phenyl)butyl amine (6a), a key intermediate to prepare antidiabetic drug repaglinide
A highly efficient palladium‐catalyzed disilylation reaction of arylhalides through C−H activation has been developed for the first time. The reaction has broad substrate scope. A variety of arylhalides can be disilylated by three types of C−H activation, including C(sp2)−H, C(sp3)−H, and remote C−H activation. In particular, the reactions are also unusually efficient. The yields are essentially
for the synthesis of fluorene and its derivatives starting from 2-iodobiphenyls and CH2Br2. A range of fluorene derivatives can be synthesized under relatively mild conditions. The reaction proceeds via a tandem palladium-catalyzed dual C–C bond formation sequence through the key dibenzopalladacyclopentadiene intermediates, which are obtained from 2-iodobiphenyls through palladium-catalyzed C–H activation