Novel Alkylsulfanylisothiazoles and Alkylsulfanylthiophenes Using Sodium α‐Cyanoketene Dithiolates as Starting Materials

A novel and efficient method for the synthesis of alkylsulfanylisothiazoles and alkylsulfanylthiophenes using sodium α‐cyanoketene dithiolates as starting components is described.     

A More Efficient Synthetic Route to Perylene-porphyrin Arrays

We present an efficient synthetic route towards two kinds of perylene-porphyrin arrays. Starting from 5, 10, 15, 20-meso-tetraphenylporphyrin, two novel 9a and 9b were designed and synthesized with 40.3% and 35.1% yield, respectively.     

α-Oxo Ketene Dithioacetals Chemistry-A Facile Route to the Synthesis of Fused Heterocyclic Compounds

Q-Oxo ketene dithioacetals and related compounds are versatile synthons in organicsynthesis'-'. The substitution reaction of or-oxo ketene dimethylthio acetals with diamineis one of the impel'tant applications for the synthesis of corresponding a-oxo ketenecyclic N, N-acetals. Junjappa and co-workers described this reaction ill a review'.However, since some kinds of ketene dimethylthio acetals are not easy to prepare, themethod melltioned above is limited. Zhu and co-workers had successfully…     

An Efficient Route to Prepare Metal Organosols by Phase Transfer Procedure

Silver and gold organosols are easily prepared by transferring nanoparticles from aqueous phase into isooctane with high efficiency (＞90%). Concentrations of sodium oleate and magnesium chloride have crucial effects on the transfer efficiency. Based on the UV-visible absorption spectra, TEM micrographs of nanoparticles, as well as molecular modeling calculation about the adsorption conformation of sodium oleate molecules, a possible phase transfer mechanism is proposed.     

A Practical Route to Synthesize 3,4-O-Isopropylidene-2- azidophytosphingosine from D-Galactose

An efficient and practical route to synthesize （2S,3S,4R）-2-azido-3,4-O-isopropyllidene-1,3,4-octadecanetriol from D-galactose in 18% overall yield was described, which required ten steps of reactions and only four times column chromatography purification.     

Novel 1,3‐Dithiolan‐2‐ones Using Sodium α‐Cyanoketene Dithiolates

A novel and efficient method for the synthesis of 1,3‐dithiolan‐2‐ones using sodium α‐cyanoketene dithiolates and monochloroacetic acid as starting components is described.     

Bromine Complexes of Polyvinylpyrrolidone Supports: A Mild Reagent for the Transformation of α‐Oxoketene Dithioacetals to β‐Oxothiolesters

When α‐oxoketene dithioacetals 1a–n were treated with the bromine complex of a copolymer of 1‐vinyl‐2‐pyrrolidone and 4‐vinylpyridine, the corresponding thiolcarboxylates 2a–n were formed in excellent yields. The reaction also works with other 1‐vinyl‐2‐pyrrolidone‐derived polymers as well as commercially available polyvinylpyrrolidone–bromine complexes. The method is suitable for preparing aliphatic, aromatic, and γ,δ‐unsaturated β‐oxothiolcarboxylates.     

Azo-coupling Decarboxylation Reaction of α-Carboxy Ketene Dithioacetals in Water-a New Route to 1,2-Diaza-1,3-butadienes

Under basic conditions,a series of 4,4-dialkylthio-1,2-diaza-1,3-butadienes were synthesized in good to excel-lent yields via a novel azo-coupling decarboxylation reaction by reacting α-carboxyl ketene dithioacetals witharyldiazonium salts in aqueous medium.     

Discoveries and Challenges en Route to Swinhoeisterol A

In this work, a full account of the authors’ synthetic studies is reported that culminated in the first synthesis of 13(14→8),14(8→7)diabeo-steroid swinhoeisterol A as well as the related dankasterones A and B, 13(14→8)abeo-steroids, and periconiastone A, a 13(14→8)abeo-4,14-cyclo-steroid. Experiments are described in detail that provided further insight into the mechanism of the switchable radical framework reconstruction approach. By discussing failed strategies and tactics towards swinhoeisterol A, the successful route that also allowed an access to structurally closely related analogues, such as Δ²²-24-epi-swinhoeisterol A, is eventually presented.     

An Efficient Route to Iodohydrin Using Polymer-supported Hypervalent Iodine（Ⅲ） Reagent

Several iodohydrins are synthesized in fairly high yields by using polystyrene-supported phenyliodine(Ⅲ)bis(trifluoroacetate).     

Vanadyl Triflate as an Efficient and Recyclable Catalyst for the Synthesis of α‐Aminonitriles

Abstract

Vanadyl triflate to catalyzed Strecker‐type reactions were successfully carried out by simply mixing aldehydes, amines, and trimethylsilyl cyanide at room temperature to afford α‐aminonitriles in good yields.     

A Mild and Facile Route to ω-Amino Esters

Lactim ethers are conveniently prepared from the corresponding lactam. The salt prepared by protonation with HC1 or HBF_4sb> is hydrclyzed in neutral water at ambient temperatures to give good yields of the ω-amino ester.     

A Novel Synthetic Route to Dihydro- and α-Hydroxytetrahydro-furan Derivatives

1-(3-Morpholinoprop-2-enyl)benzotriazole (1) provides a three carbon unit for the construction of dihydro- and tetrahydro-furan rings by one pot procedures. Lithiation of 1 followed by reaction with diaryl ketones gave 2,5-dihydro- and/or α-hydroxytetrahydro-furans, whereas successive reactions with iodoalkanes and diaryl ketones yielded 2,3-dihydrofurans.     

New Synthetic Route to Ketones from Camphene and β-Pinene

Camphene or -pinene was treated with Cp₂Zr(H)Cl (Cp = h⁵-C₅H₅) in THF to give organozirconium (IV) complexes, which were trapped with acetyl chloride or benzoyl chloride in the presence of CuI to afford ketones in yields of 63% to 74%.     

Practical and Efficient Synthesis of Orthogonally Protected α‐2,3‐Diaminopropionic Acid (2,3‐Dap), 2,4‐Diaminobutanoic Acid (2,4‐Dab), and their N‐Methylated Derivatives

The synthesis of orthogonally protected Fmoc‐Dap/Dab (Boc/Z/Alloc)‐OH starting from Fmoc‐Asp/Glu has been described. The salient features of our synthetic strategy involved formation of Fmoc‐Asp/Glu‐5‐oxazolidinone acids, conversion of acid function to acyl azides, Curtius rearrangement, and hydrolysis of the oxazolidinone group.     

A Solvothermal Route to Cu2O Nanocubes and Cu Nanoparticles

IntroductionSynthesis of Cu2O and Cu nanostructures has beenactively researched for many decades because bothCu2O and Cu are important industrial materials on ac-count of their novel physical and chemical properties.In particular,Cu2O is a p-type metal ox…     

A Facile Synthetic Route to L-Phosphinothricin

Phosphinothricin, the active ingredient of the well known broad-spectrum herbicideglufosinate-ammonium, is a naturally occurring amino acid possessing the uniquemethylphosphinate moiety, and its strong herbicidal activity has been attributed to anability to inhibit glutamine synthetase in plants and bacteria1. Further research showedthat L-enantiomer of phosphinothricin was the carrier of the activity, whereas the D formonly had a small action2, therefore the stereoselective synthesis of L-pho…     

A Facile Route to Unsymmetrical Sulfide

Unsymmetrical sulfides can be generated by the reaction of chlorine substituted aromatic compounds in sulfoxide in the presence of fluorine anion in fair yield.A likely mechanism was proposed.     

Practical and Efficient Method for α-Sialylation with an Azide Sialyl Donor Using a Microreactor

Efficient α-sialylation with a C5 azide sialyl donor was investigated under microfluidic conditions using a microreactor composed of a Comet X-01 micromixer and a tube reactor. Precise temperature control realized excellent α-selectivity, and Siaα(2,6)Gal, Siaα(2,3)Gal, and Siaα(2,9)Sia disaccharides were obtained in moderate to good yields.     

Novel Route to 2‐Arylapomorphines

The synthesis of 2‐arylapomorphines (1, 2) has been accomplished using a new method involving a Suzuki‐type cross‐coupling reaction of 2‐bromoapocodeine (8) and arylboronic acids.