Efficient Conversion of Substituted Aryl Thioureas to 2-Aminobenzothiazoles Using Benzyltrimethylammonium Tribromide
作者:Alfonzo D. Jordan、Chi Luo、Allen B. Reitz
DOI:10.1021/jo0349431
日期:2003.10.1
The reaction of molecular bromine (Br2) with arylthioureas is known to produce 2-aminobenzothiazoles (Hugerschoff reaction). We show here that benzyltrimethylammonium tribromide (1, PhCH2NMe3Br3), a stable, crystalline organic ammonium tribromide (OATB), can be readily utilized as an alternative electrophilic bromine source. It is easier to control the stoichiometry of addition with an OATB, which
Structure–activity relationship of dihydroimidazo-, dihydropyrimido, tetrahydrodiazepino-[2,1-b]-thiazoles, and -benzothiazoles as an acylation catalyst
synthesized by a condensation reaction of cyclic thioureas 15 and α-bromoacetophenones 14. Investigations of the acylation reactions of 1-phenylethanol with acid anhydrides in the presence of these cyclic isothiourea catalysts revealed their structure–activity relationships. Remarkable electronic effects resulting from substituent(s) on a benzo or phenyl moiety and the influence of the size of the annulating
One-pot synthesis of 2-aminobenzothiazoles using a new reagent of [bmim]br<sub>3</sub>in [bmim]BF<sub>4</sub>
作者:Zhang-Gao Le、Jian-Ping Xu、Huo-Yu Rao、Min Ying
DOI:10.1002/jhet.5570430447
日期:2006.7
The one-pot direct synthesis of 2-aminobenzothiazoles from phenyl isothiocyanate and amines using a newreagent of 1-butyl-3-methylimidazolium tribromide ([Bmim]Br3) in ionic liquid 1-butyl-3-methylimidazolium tetraflouoroborate ([Bmim]BF4) is described.
This invention relates to compounds of formula I their salts, and pharmaceutically acceptable derivatives thereof, pharmaceutical compositions comprising these compounds and their use in the treatment of picornavirus infections in mammals as well as novel intermediates useful in the preparation of the compounds of formula I.
1
Metal-Free Synthesis of 2-Aminobenzothiazoles via Iodine-Catalyzed and Oxygen-Promoted Cascade Reactions of Isothiocyanatobenzenes with Amines
作者:Yuanshuang Xu、Bin Li、Xinying Zhang、Xuesen Fan
DOI:10.1021/acs.joc.7b01683
日期:2017.9.15
the cascade reactions of isothiocyanatobenzenes with primary or secondaryamines by using iodine as a catalyst and oxygen as an oxidant is presented. Mechanistically, the formation of the title compounds involves the in situ formation of the required benzothiourea intermediate followed by its intramolecular cross dehydrogenativecoupling of a C(sp2)–H bond and a S–H bond. To our knowledge, this should