An Efficient Synthesis of 1,5-Benzodiazepine Derivatives by Lanthanide Trichloride-catalyzed Condensation of o-Phenylenediamine with α,β-Unsaturated Ketone under Mild Conditions

三氯化稀土有效地催化了邻苯二胺与一系列α,β-不饱和酮的反应,在温和条件下以中等到高的收率生成1,5-苯并二氮杂卓。     

Synthesis of a Novel Series of S-Alkyl Thiobenzoate Compounds as Farnesyltransferase Inhibitors

S-akyl thiobenzoate compounds were designed as farnesyltransferase (FTase) inhibitors. An effective synthetic method was explored. The structures of the target compounds were elucidated by NMR spectral and elemental analysis.     

Crystal Structure of Triethyl 6-benzoyl-3a-(4-fluorophenyl)-2,3,3a,4,5,6-hexahydro-5-methyl-1H-pyro〔1,2-a〕〔1,5〕benzodiazepine-1,2-3-tricarboxylate

１ＩＮＴＲＯＤＵＣＴＩＯＮＳｉｎｃｅｂｉｏｌｏｇｉｃａｌａｎｄｐｈａｍａｃｏｌｏｇｉｃａｌａｃｔｉｖｉｔｉｅｓｈａｖｅｂｅｅｎｗｅｌ ｋｎｏｗｎｆｏｒｎｕｍｅｒｏｕｓｈｅｔｅｒｏｃｙｃｌｉｃａｒｏｍａｔｉｃｔｒｉｃｙｃｌｅｓｉｎｒｅｃｅｎｔｙｅａｒｓ...     

Efficient One‐Pot Friedel–Crafts Acylation of Benzene and its Derivatives with Unprotected Aminocarboxylic Acids in Polyphosphoric Acid

A number of aminobenzophenones have been synthesized by acylation of benzene and its derivatives with different 2‐,3‐,4‐aminobenzoic and 4‐aminophenylacetic acids in polyphosphoric acid via Friedel–Crafts reaction as compounds with expected antitumor activity.     

Assignment of the 1H and 13C Spectra of 5-Methylthio-4H-1-(p-R1-phenyl)-3a-(p-R2-phenyl)-3a,4-dihydro (1,2,4) oxadiazolo(4,5-a), 1,5-benzodiazepines using 2D NMR Spectroscopy.

The ¹H NMR spectra of the title benzodiazepines derivatives is highly congested because all the protons are in aromatic enviroment so many proton signals remain overlap even 300 MHz or higher fields. With this in mind, the assignment of the ¹H and ¹³C spectra of these compounds obtained using COSY, NOESY, HMQC and HMBC experiments is reported.     

Fully Automated Synthesis of Novel TSPO PET Imaging Ligand [18F]Fluoroethyltemazepam

Introduction: Benzodiazepines, including temazepam are described as TSPO antagonists. In fact, TSPO was initially described as a peripheral benzodiazepine receptor (PBR) with a secondary binding site for diazepam. TSPO is a potential imaging target of neuroinflammation because there is an amplification of the expression of this receptor. Objectives: Herein, we developed a novel fluorinated benzodiazepine ligand, [¹⁸F]Fluoroethyltemazepam ([¹⁸F]F-FETEM), for positron emission tomography (PET) imaging of translocator protein (18 kDa). Methods: [¹⁸F]F-FETEM was radiolabelled with an automated synthesizer via a one-pot procedure. We conducted a [¹⁸F]F-aliphatic nucleophilic substitution of a tosylated precursor followed by purification on C18 and Alumina N SPE cartridges. Quality control tests was also carried out. Results: We obtained 2.0–3.0% decay-uncorrected radiochemical activity yield (3.7% decay-corrected) within the whole synthesis time about 33 min. The radiochemical purity of [¹⁸F]F-FETEM was over 90% by TLC analysis. Conclusions: This automated procedure may be used as basis for future production of [¹⁸F]F-FETEM for preclinical PET imaging studies.     

Crystal Structure of 1,1-Dichloro-4-formyl-3-methyl-1a-phenyl-1a,2,3,4-tetrahydro-1H-azirino〔1,2-a〕〔1,5〕benzodiazepine(C_(18)H_(16)Cl_2N_2O)

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Mass spectrometric studies of cis- and trans-1a,3-disubstituted-1, 1-dichloro-4-formyl-1a ,2,3,4-tetrahydro-1H-azirino [ 1,2-a] [1,5] benzodiazepines

The mass spectrometric behaviour of four cis- and trans-la, 3-disubstituted -1,1 -dichloro-4-formyl-1a,2,3,4-tetrahydro-1H-azirino[1, 2-a] [1,5] benzodiazepines has been studied with the aid of mass-analysed ion kinetic energy spectrometry and exact mass measurements under electron impact ioniza-tion. All compounds show a tendency to eliminate a chlorine atom from the aziridine ring, and then eliminate a neutral propene or styrene from the diazepine ring to yield azirino[ 1, 2-6][1,3]benzimidazole ions. These azmno[1,2-a] [1,5]-benzodiazepines can also eliminate HCl, or Cl plus HG simultaneously to undergo a ring enlargement rearrangement to yield 1,6-benzodiazocine ions, which further lose small molecular fragments, propyne or phenylacetylene, with rearrangement to give quinoxaline ions.     

A New and Efficient Procedure for Synthesis of 1,5‐Benzodiazepine Derivatives in Solution and under Solvent‐Free Conditions

Borax/phosphorous oxychloride (BPO) efficiently catalyzes the preparation of 1,5‐benzodiazepine derivatives of o‐phenylenediamines and ketones in solvent‐free and solution conditions. The reaction proceeds efficiently under ambient conditions giving excellent yields of the products. This new protocol allows the recycling of catalyst with no loss in its potency.