Sustainable synthesis routes towards urazole compounds
作者:Laetitia Vlaminck、Babs Van de Voorde、Filip E. Du Prez
DOI:10.1039/c7gc02027a
日期:——
The synthesis of urazoles in a one-pot, fast and high-yielding fashion without the use of isocyanates or chloroformates is described.
在不使用异氰酸酯或氯甲酸酯的情况下,以一锅法、快速且高产率的方式合成尿唑醇。
Facile One-Pot Synthesis of Substituted Hydantoins from Carbamates
作者:Manjinder Gill、Dinesh Tanwar、Anjali Ratan
DOI:10.1055/s-0036-1588468
日期:2017.10
A novel and simple approach for the preparation of 3-substituted, 5-substituted, or 3,5-disubstituted hydantoins is reported. It involves the reaction of α-amino methyl ester hydrochlorides with carbamates to yield the corresponding ureido derivatives, which subsequently cyclize under basic conditions to produce substituted hydantoins in good yields. By applying this method, the bioactive anticonvulsant
Compounds of general formula (I) are useful for treating mental disorders, wherein R.sub.1 and R.sub.2 are the same or different and selected from hydrogen or lower alkyl; Ar are the same or different and selected from pyridyl and phenyl groups, n is 1 or 2, X is nitrogen or methine. When X is nitrogen, Y is methylene. When X is methine, Y is selected from nitrogen or oxygen. A is selected from carboxylic derivatives. The pharmacologically active salts of formula (I) are also embraced. ##STR1##
An isocyanate production method according to the present invention is a method in which an isocyanate is produced by subjecting a carbamate to thermal decomposition, and includes: a step of preparing a mixture liquid containing the carbamate, an inactive solvent and a polyisocyanate compound; a step of conducting a thermal decomposition reaction of the carbamate by continuously introducing the mixture liquid into a thermal decomposition reactor; a step of collecting a low-boiling decomposition product by continuously extracting the low-boiling decomposition product in a gaseous state from the reactor, the low-boiling decomposition product having a boiling point lower than the polyisocyanate compound; and a step of collecting a high-boiling component by continuously extracting, from the reactor, a liquid phase component which is not collected in a gaseous state at the step of collecting the low-boiling decomposition product.
A novel and simple approach to the synthesis of sulfonylureas has been reported. It involved the reaction of various amines with diphenyl carbonate to yield the corresponding carbamates, which subsequently reacted with different sulphonamides to produce different sulfonylureas in excellent yields. The first reaction of diphenyl carbonate with amines was carried out in aqueous:organic (H2O:THF, 90:10)
已经报道了一种新颖且简单的合成磺酰脲类的方法。它涉及各种胺与碳酸二苯酯的反应,以产生相应的氨基甲酸酯,其随后与不同的磺酰胺反应,以优异的产率产生不同的磺酰脲类。碳酸二苯酯与胺的第一反应是在室温下于水性:有机(H 2 O :THF,90 : 10)介质中进行的,以生成氨基甲酸酯,该氨基甲酸酯与磺酰胺反应后,直接通向磺酰脲类。上述方法避免了传统的多步骤方案,并且避免使用有害,刺激性,有毒和对水分敏感的试剂,例如光气,异氰酸酯和/或氯甲酸酯。