Showing papers in "Synthetic Communications in 1989"

TL;DR: Dimethyl (1-diazo-2-oxopropyl) phosphonate (3) was transformed to dimethyl (diazomethyl)-phosphonate(4), which was used for the synthesis of enol ether or alkyne without isolation.

TL;DR: ZnBr2 in dichloromethane is a convenient reagent for mild and selective removal of the tert-butoxy carbonyl group from secondary amines as discussed by the authors.

TL;DR: Tetrachlorosilane was found to be a mild as well as selective catalyst for dithioacetalization of the carbonyl compounds as mentioned in this paper, and it was used as a catalyst for the synthesis of carbonyls.

TL;DR: In this paper, the reaction of benzoyl substituted ketene mercaptals with diamines was used to synthesize 2-(Benzoylmethylene)imidazolidines and 5,hexahydropyrimidines.

TL;DR: In this paper, the reaction of thiourea in the absence or in the presence of ethanol, towards several furanic, aromatic, aliphatic, and cyclic epoxides is studied.

TL;DR: The utility of 3-chloroperoxybenzoic acid (m-CPBA) combined with trifluoroacetic acid (TFA) in Baeyer-Villiger oxidations is described in this paper.

TL;DR: O-Alkyl, S-methyl dithiocarbonates of phenol, benzyl, primary and secondary alcohols were prepared in a one pot procedure under phase transfer catalysis conditions.

TL;DR: In this article, trisubstituted methanes derivatives are quantitatively and selectively obtained by condensation of 2-methylfuran or 2-methylthiophene with diverse aldehydes using macroporous ion exchange resins as catalyst.

TL;DR: In this article, a new method of generating nitrilimines was described, which involves the reaction of aromatic as well as aliphatic aldehyde hydrazones with chloramine-T.

TL;DR: The palladium-catalysed coupling of 3,5 Di-O-p-toluoyl-5-iodo-2′ -deoxyuridine with functionalized and non-functionalized alkenylstannanes gave moderate to good yields of the corresponding 5-alkenyl-2 -Deoxyuridines.

TL;DR: At 40-80°C, t.BuOOH in conjunction with catalytic amounts of (n.Bu3 SnO)2 CrO2 1 oxidizes benzylic alcohols, methylenes in α-position of aryl, ethylenic or acetylenic groups into ketones, anthracene into anthraquinone, adamantane into adamantan-1-ol and 2-one.

TL;DR: Diols can be prepared by hydroxilation of alkenes with m-chloroperoxybenzoic acid in water with high yield and complete anti stereospecificity.

TL;DR: Heteroaromatic N-oxides bearing various functionalities are readily and selectively converted under mild conditions into the corresponding bases using TiCl4/SnCl2 as mentioned in this paper, which is the most common base for Noxides.

TL;DR: In this article, a convenient synthesis of diazocarbonyl compounds from tosyl azide and carbonyl compound with Al2O3-KF as solid base is reported.

TL;DR: In this article, two routes for the synthesis of furo[2,3-c]quinolines were explored, based on the cross-coupling of 2-formyl-3-furanboronic acid with functionalized haloarenes, catalyzed by a Pd(0) complex.

TL;DR: In this article, secondary amines with dimethyl-dioxirane gave hydroxylamines in a simple, one-step and high yield process, which is similar to our process.

TL;DR: The palladium-catalyzed coupling of iodothiophenes and stannylthiophenses gave good yields of bithiophene derivatives as mentioned in this paper, which is tolerant of numerous functional groups.

TL;DR: In this paper, it is reported exclusive formation of alkylated phosphorane from its salt from benzyl bromide in chloroform, which can be used conveniently to synthesise above compounds in good yields.

TL;DR: In this paper, a simple method for the synthesis of amines by the reduction of imines, anils and enamines, including some chiral substrates, with the MCl2/NaBH4/CH3OH reagent (M = Co, Ni) in 64-82% yields is described.

TL;DR: In this article, a mild and chemoselective protection of aldehydes as 1,3-dithiolanes is described, and high yields are obtained at room temperature even in the presence of ketones.

TL;DR: An efficient method for the dehydration of tertiary alcohols to obtain olefins in high yield, employing methanesulfonyl chloride-triethylamine and catalytic amount of 4-dimethylaminopyridine in dichloromethane, is described in this article.

TL;DR: In this paper, Borohydride supported on an ion exchange resin selectively reduced α,β-unsaturated nitroalkenes to Nitroalkanes in high yields, and the isolation of pure products by simple filtration was a key feature of this method.

TL;DR: In this article, a simple one-pot synthesis of 3-benzoylamino-5-oxo-5, 6, 7, 8-tetrahydrocoumarins from 1, 3-cyclohexanediones, hippuric acid, acetic anhydride and triethyl orthoformate or other one-carbon synthetic equivalent is described.

TL;DR: In this paper, high reactive copper solutions have been prepared by the direct reduction of lithium 2-thienylcyanocuprate (L2C) using thienyl-based organocopper reagents as opposed to phosphine-based reagents.

TL;DR: A combination of pyridinium dichromate/tert-butyl hydroperoxide (1:1) was found to be an excellent reagent for the highly selective regeneration of ketones from ketoximes.

TL;DR: In this paper, the Wittig-Horner reaction was used to synthesize high yields in a one-pot by using methyl phenyl sulfone at low temperature, which was then used for synthesizing high yields of a single-pot WSH.

TL;DR: In this article, a reproducible, large scale and practical synthesis of N-(benzyloxycarbonyl)-L-vinylglycine methyl ester starting from L-methioninemethyl ester hydrochloride is described.

TL;DR: The reaction of N-methoxy-derivatives of pyridines in methanol with ammonium persulphate gives improved yields of mono-hydroxymethylated products as mentioned in this paper.

TL;DR: In this article, the improved oxidative conversion of Vitamin D2 into the Windaus ketone as well as the regioselective hydroxylation via organoboranes at C26 of the title ketone is reported.

TL;DR: In this paper, the β-oxo δ-enol lactone isomer has been prepared in two steps starting from the readily available ketoester 6. Selective C or O-acylation of the SiMe3 or Li enolates of 6 and intramolecular cyclisation of the new adducts 8 or 9 lead to 1 and 2 in good yields (48% and 52% respectively starting from ethyl isobutyrate)