51164-42-2Relevant articles and documents
Oxidation of tertiary benzamides by 5,10,15,20-tetraphenyl- porphyrinatoironIII chloride-tert-butylhydroperoxide
Constantino, Luis,Iley, Jim
, p. 1894 - 1900 (2007/10/03)
Tertiary benzamides are oxidized by the 5,10,15,20- tetraphenylporphyrinatoiron(III) chloride-ButOOH system at the α-position of the N-alkyl groups. The major products are N-acylamides, although small amounts of secondary amides, the products of dealkylation, are also formed. Plots of initial rate versus initial substrate concentration for these reactions are curved, suggesting formation of an oxidant-substrate complex. The reaction rates are almost insensitive to the substituent in the benzamide moiety, but there is a kinetic deuterium isotope effect of 5.6 for the reaction of the N,N-(CH3)2 and N,N-(CD3) 2 compounds. Comparison of the reaction products from N-alkyl-N-methylbenzamides reveals that, for all compounds studied except N-cyclopropyl-N-methylbenzamide, oxidation of the alkyl group is preferred, strongly so (by a factor of ca. 8) for N-allyl-N-methylbenzamide. In contrast to microsomal oxidation, there is no steric hindrance to oxidation of an isopropyl group. Thus, we propose that these reactions proceed via hydrogen atom abstraction to form an α-carbon-centred radical and we attribute the observed diminished reactivity of the N-cyclopropyl group to its known reluctance to form a cyclopropyl radical. Oxidation of N-methyl-N-(2,2,3,3- tetramethylcyclopropyl)methylbenzamide provides preliminary evidence for rearrangement of an intermediate radical. While it remains unclear how these reactions proceed directly to the N-acyl products, we have established that N-hydroxymethyl, N-alkoxymethyl and N-alkylperoxymethyl intermediates are not involved.
A New Direct Synthesis of Tertiary N-Acyloxymethylamide Prodrugs of Carboxylic Acid Drugs
Moreira, Rui,Mendes, Eduarda,Calheiros, Teresa,Bacelo, Maria J.,Iley, Jim
, p. 7107 - 7110 (2007/10/02)
N-Alkyl-N-chloromethylamides 2, prepared from secondary amides, paraformaldehyde and chlorotrimethylsilane, react readily with carboxylate anions to generate the corresponding tertiary N-acyloxymethylamides 3 in good yield; the latter give rise to the parent carboxylic acids in aqueous media at pH 7.4 and 37 deg C with half-lives between ca. 1 min and 42 h.
Synthesis and reactivity of aliphatic and (hetero) aromatic N-alkyl-N-(diphenyloxophosphinyl)methyl carboxamides and lactams
Couture,Deniau,Grandclaudon
, p. 2381 - 2392 (2007/10/02)
A variety of aliphatic, aromatic and heteroaromatic N-alkyl-N-(diphenyloxophosphinyl)methyl carboxamides and lactams have been prepared by preliminar chloromethylation of the appropriate secondary amides and subsequent treatment with ethyl diphenylphosphinite.
