35607-83-1Relevant articles and documents
An Extremely Powerful Acylation Reaction of Alcohols with Acid Anhydrides Catalyzed by Trimethylsilyl Trifluoromethanesulfonate
Procopiou, Panayiotis A.,Baugh, Simon P.D.,Flack, Stephen S.,Inglis, Graham G.A.
, p. 2342 - 2347 (2007/10/03)
Trimethylsilyl trifluoromethanesulfonate is an excellent catalyst for the acylation of alcohols with acid anhydrides. Highly functionalized primary, secondary, tertiary, and allylic alcohols, and phenols, were acylated cleanly and efficiently and in a fraction of the time used under the standard DMAP conditions.
2,4,6-TRIPYRIDINIO-1,3,5-TRIAZINE TRICHLORIDE, A NEW AND MILD ESTERIFICATION AGENT FOR PREPARATION OF PENICILLIN ESTERS
Murakami, Masayuki,Hajima, Makoto,Takami, Fumitaka,Yoshioka, Mitsuru
, p. 2055 - 2064 (2007/10/02)
Cyanuric chloride reacted with 3-molar equivalents of pyridine to give 2,4,6-tripyridinio-1,3,5-triazine trichloride, which was found to condense penicilins with alcohols under mild conditions to afford penicillin esters in good yields.Application to prep
CYCLOADDITION REACTIONS OF CEPHALOSPORIN COMPOUNDS, X. SYNTHESIS AND STEREOCHEMISTRY OF BENZHYDRYL 7β-(2-THIENYL)ACETAMIDO-2-SPIROCYCLOPROPYL-2(2',2'-DIPHENYL)-3-ACETOXYMETHYL-3-CEPHEM-4-CARBOXYLATE 1S(β)-OXIDE
Pitlik, Janos,Jaszberenyi, J. Csaba
, p. 847 - 854 (2007/10/02)
Cycloadditions are useful methods to synthesize novel β-lactam derivatives .In our laboratory we studied the 1,3-dipolar cycloaddition reactions of 2-methylenecephems with diazoalkanes .In this paper we report the synthesis and structure elucid
Process for preparing cephalosporin esters in the presence of liquid sulfur dioxide
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, (2008/06/13)
A process for preparing a cephalosporin ester which comprises subjecting an organic halide or an alcohol to reaction with a cephalosporin acid, a cephalosporin acid halide or a salt thereof in the presence of liquid sulfur dioxide.
Extraction of N-blocked amino acids from aqueous media
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, (2008/06/13)
N-blocked amino acids, particularly derived from natural sources such as fermentation liquors, are extractively esterified from aqueous media by treatment of the aqueous solution with a diazoalkane, e.g. diphenyldiazomethane, in the presence of a water-im
Process for the preparation of esters of N-blocked penicillin acids which comprises reacting the acid or a salt thereof with a primary amine and a nitrosating agent
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, (2008/06/13)
A process is described for the preparation of esters of N-blocked amino acids (such as penicillins or cephalosporins) wherein the amino acid or a salt thereof is reacted with a primary amine and nitrosating agent.