Showing papers in "Synthetic Communications in 1991"

TL;DR: Asymmetric hydrocyanation of aldehydes was accomplished using almond meal, containing the enzyme oxynitrilase as discussed by the authors, which achieved high levels of enantiomeric purity.

TL;DR: In this article, 1,3-Diynes were synthesized by a facile palladium-copper catalyzed coupling of 1-alkynes with 1-iodoalkynes.

TL;DR: In this article, aldehydes were used to condense phenylsulfonylacetate into unsaturated sulfone without solvent in the presence of KF on alumina under microwave irradiation.

TL;DR: Several Hantzsch 4-alkyl-1,4- dihydropyridines have been oxidized to the corresponding aromatic systems as mentioned in this paper, and an unexpected mixture of 4alkyl pyridine and/or dealkylated pyridine is formed.

TL;DR: In this paper, a number of protected 7-hydroxyindoles were prepared by reaction of the protected 2-nitrophenols with vinylmagnesium bromide, and they were shown to be the protecting group of choice, giving good yields of the indole and being readily removed for subsequent transformations of the 7hydroxy function.

TL;DR: Alkyl halides add smoothly to a variety of olefinic bonds conjugated with electron withdrawing groups, in the presence of zinc-copper couple.

TL;DR: In this article, various Zeolite catalysed Diels-Alder reactions of cyclopentadiene, cyclohexadiene and furan with less reactive dienophiles were studied.

TL;DR: In this paper, N-tert-Butoxycarbonyl, N-benzoyl, and oxazolidinone derivatives of β-amino alcohols have been obtained from amino acids in 72 to 90 % yields through lithium aluminum hydride reduction followed by in situ derivatization.

TL;DR: In this paper, reaction of aldoximes with iodobenzene dichloride leads to formation of corresponding nitrile oxides in good yields in a single pot reaction.

TL;DR: In this article, two synthesized 5-methoxyninhydrin (2,2-dihydroxy-5methoxy-1,3-indanedione) are described.

TL;DR: In this paper, Tiecco's method using NiCl2, triphenylphosphine and zinc in DMF was applied to 2,2′-bipyrimidine.

TL;DR: In this paper, the authors report on the synthesis and storage of D-glyceraldehyde acetonide for as long as three years after initial preparation while retaining its enantiomeric purity.

TL;DR: Aldehydes are reduced in ethanol under reflux condition in high yelds as mentioned in this paper, and a reagent that discriminates aldehyde from ketones is used to distinguish them.

TL;DR: In this paper, 2-substituted 1H-perimidines are readily prepared by refluxing a mixture of sodium pyrosulfite, an aldehyde, and 1, 8-diaminonaphthalene in aqueous ethanol or N, N-dimethylformamide.

TL;DR: In this article, the authors describe the oxidation of 4-aryl-1,4-dihydrophyridines with MnO2 on Mexican Bentonite, without solvents, using as energy source a microwave over.

TL;DR: In this article, the authors reported a flexible knoevenagel condensations catalysed by new montmorillonitesilylpropylethylenediamine (MPL) was reported.

TL;DR: In this paper, a facile conversion of aliphatic isocyanates to N,N-dinitramines has been developed, which is treated with a mixture of nitronium fluoroborate and nitric acid in acetonitrile.

TL;DR: In this article, the corresponding α and β -Methyl D-Glucofuranosides were transformed to the corresponding β -methyl Dglucose and D-Galactose in good yields using methanol and Ferric chloride as catalyst.

TL;DR: Ortholithiation reactions are shown to be effective tools for the synthesis of Ebselen (N-phenyl-benzisoselenazolin-3-one) derivatives as mentioned in this paper.

TL;DR: In this article, an improved procedure for preparation of 4-formyl-3,5-dimethoxyphenol is reported, with the principal advantages of the new procedure being complete regioselectivity and higher yield.

TL;DR: In this paper, the dialkylditellurides and selenium were prepared in high yields and in a one-pot procedure by the reduction of elemental tellurium with phenyl hydrazine in basic medium (NaOH/DMF) followed by treatment with organohalides.

TL;DR: In this paper, the synthesis and photochemical rearrangement of oxaziridines derived from 3-benzyloxy- and 3-phenylcyclobutanone were examined.

TL;DR: In this paper, phase transfer catalysis without solvent was used for the alkylation of phenol, hydroquinone and p-aminophenol, achieving high yields of α,ω-diphenoxyalkanes, hydro-quinone diethers and high selective mono O-alkylation.

TL;DR: In this paper, a convenient procedure for the N-alkylation of azoles with 2-chloroethylamine under phase-transfer catalysis conditions is described. But this procedure is not applicable to the case of azolines.

TL;DR: In this paper, a nover route for the preparation of a series of 1-aminoalkylphosphonate deisters, precursors to analogues of aamino acids, was devised.

TL;DR: Variously N-protected α-aminoaldehydes exhibit reasonable diastereoselectivity in the Baylis-Hillman coupling with methyl acrylate to provide either primarily syn or anti α-methylene-β-hydroxy-γ-Amino esters.

TL;DR: Trimethylsilyl trifluoromethanesulfonate (TMSOTf) catalyzed addition of 1-trimethyl silyloxy-1-phenylethene to N-ethoxy carbonyl-and N-tert-butoxycarbonyl -2-ethoxypiperidines (3d and 3b, respectively) afforded the corresponding ketocarbamates in excellent yields as mentioned in this paper.

TL;DR: In this article, the authors used barium permanganate in refluxing acetonitrile to perform sulfide oxidation to their sulfoxides, which was performed with barium-peranganate.

TL;DR: Sulfonated charcoal has been shown to be a very effective and mild catalyst for the tetrahydropyranylation of alcohols and phenols as mentioned in this paper, and has been demonstrated to be very effective in the synthesis of tetrahedron-based drugs.