135701-58-5Relevant articles and documents
Novel Solid-phase and solution-phase synthetic methods for trisubstituted Thieno[3,2-d]pyrimidine derivatives
Jeon, Moon-Kook,Kim, Jung-Gyu,Lee, Duck-Hyung
, p. 1406 - 1414 (2016)
The coupling of 7-aryl-3,4-dihydro-4-oxothieno[3,2-d]pyrimidine-2-carboxylic acid with a primary alkylamineloaded acid-sensitive methoxy benzaldehyde (AMEBA) resin, a benzotriazol-1-yloxytris(dimethylamino) phosphonium hexafluorophosphate (BOP)-mediated amination reaction, and cleavage from the solid support yielded N-alkyl-4-(alkylamino)-7-arylthieno[3,2-d]pyrimidine-2-carboxamide derivatives. The progress of the reactions on solid phase was monitored through attenuated total reflectance-FTIR spectroscopy and was compared with representative solution-phase surrogates. Additionally, N-acylation (acid chloride, InF3 , CH3 CN, room temperature) and cyclization (DBN, 1,4-dioxane, 80 ° C) of a 3-amino-4-(4-t-butoxycarbonylphenyl) thiophene-2-carboxamide intermediate under previously unreported conditions provided 2-substituted thieno[3,2-d]pyrimidin-4(3H)-one derivatives, which were subsequently converted to 2-substituted 4-alkylamino-7-[4-(alkylaminocarbonyl)phenyl]thieno[3,2-d]pyrimidine derivatives through a reaction sequence consisting of a BOP-mediated amination reaction, t-butyl deprotection, and amide formation.
Efficacious N-protection of O-aryl sulfamates with 2,4-dimethoxybenzyl groups
Reuillon, Tristan,Bertoli, Annalisa,Griffin, Roger J.,Miller, Duncan C.,Golding, Bernard T.
, p. 7610 - 7617 (2012/10/29)
Sulfamates are important functional groups in certain areas of current medicinal chemistry and drug development. Alcohols and phenols are generally converted into the corresponding primary sulfamates (ROSO2NH 2 and ArOSO2NH2, respectively) by reaction with sulfamoyl chloride (H2NSO2Cl). The lability of the O-sulfamate group, especially to basic conditions, usually restricts this method to a later stage of a synthesis. To enable a more flexible approach to the synthesis of phenolic O-sulfamates, a protecting group strategy for sulfamates has been developed. Both sulfamate NH protons were replaced with either 4-methoxybenzyl or 2,4-dimethoxybenzyl. These N-protected sulfamates were stable to oxidising and reducing agents, as well as bases and nucleophiles, thus rendering such masked sulfamates suitable for multi-step synthesis. The protected sulfamates were synthesised by microwave heating of 1,1′-sulfonylbis(2-methyl-1H-imidazole) with a substituted phenol to give an aryl 2-methyl-1H-imidazole-1-sulfonate. This imidazole-sulfonate was N-methylated by reaction with trimethyloxonium tetrafluoroborate, which enabled subsequent displacement of 1,2-dimethylimidazole by a dibenzylamine (e.g. bis-2,4-dimethoxybenzylamine). The resulting N-diprotected, ring-substituted phenol O-sulfamates were further manipulated through reactions at the aryl substituent and finally deprotected with trifluoroacetic acid to afford a phenol O-sulfamate. The use of 2,4-dimethoxybenzyl was particularly attractive because deprotection occurred quantitatively within 2 h at room temperature with 10% trifluoroacetic acid in dichloromethane. The four key steps in the protocol described [reaction of 1,1′-sulfonylbis(2-methyl-1H-imidazole) with a phenol, methylation, displacement with a dibenzylamine and deprotection] all proceeded in very high yields.
Synthesis of 2-amino-5-benzoyl-4-(2-furyl)thiazoles as adenosine A2A receptor antagonists
Cole, Andrew G.,Stauffer, Tara M.,Rokosz, Laura L.,Metzger, Axel,Dillard, Lawrence W.,Zeng, Wenguang,Henderson, Ian
scheme or table, p. 378 - 381 (2011/03/18)
The discovery and synthesis of a series of 2-amino-5-benzoyl-4-(2-furyl)thiazoles as adenosine A2A receptor antagonists from a small-molecule combinatorial library using a high-throughput radioligand-binding assay is described. Antagonists were
Highly selective TFAA-cleavage of tertiary 2,4-dimethoxybenzylamines and its use in the synthesis of secondary amines
Nussbaumer,Baumann,Dechat,Harasek
, p. 4591 - 4602 (2007/10/02)
TFAA-treatment of allylic, propargylic, homopropargylic and some benzylic tert. 2, 4-dimethoxybenzylamines leads to highly selective cleavage of their dimethoxybenzylic C-N bonds. The resultant trifluoroacetamides can then readily be converted to the corresponding secondary amines.