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Investigation of the acylation scope of carbohydrates by metalloprotease thermolysin immobilized on Celite as biocatalyst has been carried out. The reactions were performed in DMSO, a good solvent for carbohydrates, where the enzyme has previously shown its activity in transesterifications of...
1-Arylmethyl-2-(bromomethyl)azirdines were converted into the corresponding 2-(aryloxymethyl)aziridines upon treatment with the appropriate potassium phenoxides in DMF/acetone in excellent yields, followed by regioselective ring opening towards N , N -di(arylmethyl)- N...
The generation of an unexpected Brønsted acidity in anhydrous DMF at 50 °C was evidenced by NMR measurements during the investigation on the course of sucrose cleavage by ceric ammonium nitrate (CAN). The formation of a nitrooxy derivative of DMF by reaction with CAN is responsible for this...
Asymmetric domino reactions are reviewed for the first time. The second part of the review includes asymmetric domino reactions catalysed by chiral catalysts and asymmetric biocatalysed domino reactions and covers the classification and characteristics of these asymmetric domino reactions,...
The title compounds having different substituents on the heterocyclic framework were prepared by several methods from 2-acetamido-3-hydroxypyridine. The condensation of 2-protected-amino-3-hydroxypyridine with 2-chloroacrylonitrile or ethyl 2,3-dibromopropionate provided in several cases two...
A series of new aminophosphine oxides, aminophosphonic and aminophosphinic acids derived from thiazole was synthesized by addition of phosphine oxides or silylated phosphorus esters to the corresponding thiazole aldimines. The thiazole aldimines were obtained from 2-thiazole aldehyde and primary...
In the presence of a catalytic amount of NEt 3 , ethyl 4,4,4-trifluoro-3-oxobutanoate 1 reacted readily with arylidenemalononitriles 2 in ethanol at room temperature. It gave two products 2-trifluoromethyl-3,4-dihydro-2 H -pyran derivatives 3 and 2-(trifluoromethyl)piperidine derivatives 4 , the...
Various N -sulfenyl heterocycles were synthesized by transamination of sulfenamides using a chlorine gas-free method. The N -sulfenyl heterocycles behaved as sulfenylating reagents of anilines; N -sulfenylbenzimidazoles were the most effective.
Reactions of alkyl halides with arylmagnesium bromides in the presence of cobalt(II)(diphosphine) complexes are discussed. Treatment of 1-bromooctane with phenylmagnesium bromide with the aid of a catalytic amount of CoCl 2 (dppp) (DPPP=1,3-bis(diphenylphosphino)propane) yielded octylbenzene in...
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