4-Substituted-3-alkyl-3,4-dihydro-2<i>H</i>-1,3-benzoxazin-2-ones II (1,2). Solvolytic transformations of urea and thiourea derivatives into 1-alkyldihydro-6-(2-hydroxyaryl)-1,3,5-triazine-2,4-(1<i>H</i>,3<i>H</i>) diones
作者:George Bobowski、John Shavel
DOI:10.1002/jhet.5570150723
日期:1978.10
3-benzoxazin-4-yl)ureas (II, Table I) and 3,4-dihydro-2-oxo-(3-substituted-2H-1,3-benzoxazin-4-yl)thioureas (Table II) was prepared by treating 3,4-dihydro-4-hydroxy-3-substituted-2H-1,3-benzoxazin-2-ones with ureas and thioureas, respectively. In the presence of alcoholic alkali these compounds underwent transacylation to dihydro-6-(2-hydroxyaryl)-1,3,5-triazine-2,4-(1H,2H)diones (Table III) and their
一系列3,4-二氢-2-氧-(3-取代的2 H -1,3-苯并恶嗪-4-基)脲(II,表I)和3,4-二氢-2-氧-((通过处理3,4-二氢-4-羟基-3-取代的2 H -1,3-苯并恶嗪-2制备3-取代的-2 H -1,3-苯并恶嗪-4-基)硫脲(表II)。-分别带有尿素和硫脲的化合物。在醇性碱的存在下,这些化合物进行转酰基化为二氢-6-(2-羟基芳基)-1,3,5-三嗪-2,4-(1 H,2 H)二酮(表III)和它们的4-硫代类似物(表IV)。
A Simple, One-Step Synthesis of 3,4-Dihydro-4-phenacyl-2<i>H</i>-1,3-benzoxazin-2-ones
作者:Nazih Latif、Fahmy M. Asaad、Nabil Grant
DOI:10.1055/s-1988-27532
日期:——
2-Hydroxychalcones 1a, b react readily with alkyl and aryl isocyanates in the presence of potassium hydroxide to give directly the corresponding 3-alkyl- and 3-aryl-3,4-dihydro-4-phenacyl-2H-1,3-benzoxazin-2-ones 3. The 2-thione analogues 5a, b are similarly obtained by reacting 1a, b with methyl isothiocyanate. Thiones 5 are readily oxidized by yellow mercuric oxide to the corresponding oxo compounds 3. The direct formation of benzoxazinones from chalcones apparently proceeds through the intermediate formation of open chain carbamates.The latter are cleaved readily by p-toluenesulfonyl chloride under base catalysis to give the corresponding sulfonates.
Reaction of isocyanates with o-hydroxy aromatic aldehydes. Condensations of 3,4-Dihydro-4-hydroxy-3-alkyl-2H-1,3-benzoxazin-2-ones with compounds having active hydrogen
作者:George Bobowski、John Shavel
DOI:10.1021/jo01279a024
日期:1967.4
Bobowski, George; Shavel, John, Journal of Heterocyclic Chemistry, 1980, vol. 17, p. 519 - 528
作者:Bobowski, George、Shavel, John
DOI:——
日期:——
BOBOWSKI G.; SHAVEL J. JR., J. HETEROCYCL. CHEM., 1980, 17, NO 2, 277-287