N-acetylureas were synthesised regioselectively from 1,3-disubstituted selenoureas and zinc acetate. Regioselectivity was dependent on the pKa of the amine attached to the selenourea and occurred towards the amine with the lower pKa. The approach provided a simple, mild and efficient way to ...
results in enhanced yields and simplified purification procedures. The polymer supported coupling agent in its urea form is easily filtered from the reaction mixture. An additional advantage is provided in that the used polymer support may be recycled to retrieve the DCC form, which is ready for ...
Acylation or phosphorylation of hydroxyurea unexpectedly takes place on N rather than on O, leading to the formation of amides instead of the expected estersurea derivatives (acyclic compoundsprotection, deprotectionhydrosilylation, silylation, phosphorylation...
ChemInform Abstract: Acylation or Phosphorylation of Hydroxyurea Unexpectedly Takes Place on N Rather than on O, Leading to the Formation of Amides Instead of the Expected Esters.urea derivatives (acyclic compounds)protection, deprotectionhydrosilylation, silylation, phosphorylation...
Neutral Pan-EB was reacted with benzoyl chloride, p-t -butylbenzoyl chloride or pivaloyl chloride in N,N 鈥 -dimethylpropylene urea (DMPU) solutions. While the benzoyl and pivaloyl derivatives showed very poor solubility in common organic solvents, the p-t -butylbenzoyl derivative was ...
The carbamyl fluoride SF 5 NHC(O)F reacts with both H 2 O and H 2 S to give the urea (SF 5 NH) 2 CO. Evidence supports that this reaction proceeds through a mechanism involving dehydrofluorination; whereas, the reagents PhLi and PCl 5 serve only to dehydrofluorinate SF 5 NHC(O)F...
urea derivatives (benzene compoundscarboxylic amides (benzene compoundsCycloalkylation of N -phenyl- N ′-R-thiourea with 3-aryl-2-propenoyl chlorides in acetone gives as products 6-aryl-3-phenyl-2-(R-imino)-2,3,5,6-tetrahydro-4 H -1,3-thiazin-4-one and their hydrochlorides. The same...
urea derivatives (benzene compounds)ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original...
Distillation of the crude extract leads to naphthyridones 12 (yield up to 10%) which result from thermocyclization of the enamides 5f, 5g and 7f. Various by-products are isolated such as N, N-dimethyl-N', N'-diphenylmethyleneurea resulting from N-lithiodiphenylketimine and phenacylpyridines...
urea derivatives (benzene compounds)carboxylic amides (benzene compounds)ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.V. N. Britsun...