Showing papers in "Tetrahedron Letters in 1981"

TL;DR: In this article, the development of a new class of nucleoside phosphites is described, which are stable to normal laboratory conditions, are activated by mild acid treatment, and are observed to react essentially quantitatively with protected nucleosides.

TL;DR: Readily preparable N-methoxy-N-methylamides couple in good yields with Grignard and organolithium reagents to produce ketones, and are reduced with hydrides to afford aldehydes.

TL;DR: Potassium hydrogen persulfate in aqueous methanol was found to be a convenient, inexpensive, and chemoselective reagent for the oxidation of sulfides to sulfones and sulfoxides in the presence of other common functional groups as mentioned in this paper.

TL;DR: In this article, the synthesis and applications for three useful reagents for silylation of unreactive substrates, triisopropylsilyl, octadecyldimethylsilylsilyl triflate, and octadecycledimethyl silyl (ECS), were described.

TL;DR: Aniline reacts with saturated and 2,3-unsaturated alcohols in the presence of ruthenium catalyst at 180°C to give N-alkylanilines and 2-3-alkylquinolines in good yields as discussed by the authors.

TL;DR: In this paper, various alcohols were converted to their corresponding thiolacetates by treatment with triphenylphosphine and diisopropyl azodicarboxylate in the presence of thiolacetic acid.

TL;DR: A new toxic metabolite was isolated from Penicillium paraherquei and the structure was determined by X-ray diffraction analysis as mentioned in this paper, which was designated as paraherquamide.

TL;DR: Ketones are converted smoothly into the corresponding acyloin with a high degree of selectivity upon treatment with iodosobenzene or phenyliodosodiacetate in methanolic sodium hydroxide.

TL;DR: In this paper, it was shown that very large differences exist in the internal distribution of natural deuterium and the 2H quantitative NMR method is proposed as an efficient tool for characterizing the chemical and geographical origin of a molecule and for investigating chemical and biochemical mechanisms.

TL;DR: In this paper, 1,3-Diene monoepoxides react with nucleophiles in the presence of palladium complex as a catalyst under neutral conditions to give 1,4-adducts selectively.

TL;DR: In the presence of Pd catalysts and under mild, essentially nonbasic conditions, the allyloxycarbonyl derivatives of alcohols may be either converted into the corresponding allyl ethers or hydrogenolysed (Bu 3 SnH) back to the starting alcohol as mentioned in this paper.

TL;DR: In this paper, the authors showed that in the presence of triphenylphosphine, CCl4 and tert. bases, 50 to 75% yield the corresponding Δ2-oxazolines, Δ2oxazines, Δ 2-thiazolines and Δ2imidazoline.

TL;DR: Aryl phosphorodichloridates can be converted by means of 1-hydroxybenzotriazole into an effective phosphorylating agent, which can be applied to the synthesis of phosphotriester intermediates of nucleic acids as mentioned in this paper.

TL;DR: In this article, a new silicon-based protecting group for primary amines has been developed, and its usefulness is illustrated in a simple synthesis of an alkylated amino acid derivative.

TL;DR: In this article, the authors showed that pairing of terminal alkynes with protected 5-iodouracil nucleosides in the presence of dichlorobis(triphenylphosphine)palladium and copper(I) iodide in triethylamine gives the corresponding 5-(alkyn-1-yl)uracil (1.

TL;DR: In this article, remarkable threo selectivity was observed in the reaction of aldehydes with trans-and cis-1-bromo-2-butene with the aid of chromium-II salts.

TL;DR: RuCl 2 (PPh 3 ) 3 -benzene system has been found to be highly effective for the title selective oxidation providing 10-hydroxyundecanal in 89% yield from 1,10-undecanediol as discussed by the authors.

TL;DR: In this paper, the nitro group in tertiary or secondary aliphatic nitro compounds is replaced by hydrogen or deuterium on treatment with tributyltin hydride or tributalltin deuteride, respectively.

TL;DR: RuCl 2 (PPh 3 ) 3 catalyzes the oxidation of primary alcohols to carbonyi compounds by iodosylbenzene and that of aldehydes to carboxylic acids as discussed by the authors.

TL;DR: A host-specific phytotoxic fraction obtained from the cell-free culture filtrate of A. alternata f. sp. lycopersici is shown to consist of two esters of 1,2,3-propanetricarboxylic acid and 1-amino-11,15-dimethylheptadeca-2,4,5,13,14-pentol 1 as mentioned in this paper.

TL;DR: In this article, a homogeneous catalytic oxidative condensation of alcohols and diols to their corresponding esters and lactones has been accomplished using RuH 2 (PPh 3 ) 4.

TL;DR: In this paper, a simple synthesis of (7E, 9Z)-dodecadien-1-yl acetate has been realized, which can be used to synthesize trans (or cis)-dichloroethylene.

TL;DR: Pyrrole derivatives are prepared in high yields by the catalytic action of a Pd(II) salt on 1-amino-3-alkyn-2-ols which are obtained from conjugate ynones.

TL;DR: Titanium enolates derived from ketones and esters react with aldehydes to afford erythro adducts with high diastereoselection as mentioned in this paper.

TL;DR: A new polyisoprenylated phenolic pigment, garcinol, and its colourless isogarcinol, have been isolated from Garcinia indica and their structures proposed on the basis of chemical and spectral data.

TL;DR: The sex attractant pheromone of the citrus mealybug, Planococcus citri (Risso), has been Identified as (1 R - cis )-(+)-2,2-dimethyl-3-(1-methylethenyl)cyclobutanemethanol acetate (VI) as mentioned in this paper.

TL;DR: In this paper, a selective catalytic monoalkylation of arylacetonitriles by primary alcohols can be achieved at ≤ 100° using a catalyst prepared in situ from rhodium trichloride, triphenylphosphine and sodium carbonate.

TL;DR: In this article, an epoxide with a diethylaluminum amide in dichloromethane at room temperature affords the corresponding β-amino alcohol in good yield.