Functionalisation in position 3 of 3,5-dichloro-2H-1,4-oxazin-2-ones
摘要:
Electrophilic catalysis is shown to give selective substitution of the imidoyl chloride group in 3,5-dichloro-2H-1,4-oxazin-2-ones, avoiding competitive reactions of the nucleophile with the lactone function. With other nucleophiles (SCN-, CH2N2) cyclisations involving the azadiene- or the imine function take place. Cycloaddition of the obtained oxazinones to acetylenic compounds provides polyfunctionalized pyridines.
Synthesis of new [1,2,3]triazoles and 1H-tetrazoles via reactions of 3,(5)-(Di)chloro-2H-1,4-(benz)oxazin-2-ones with diazocompounds or sodium azide
作者:Bart Medaer、Koen Van Aken、Georges Hoornaert
DOI:10.1016/0040-4039(94)88381-5
日期:1994.12
Treatment of 3,(5)-(di)chloro-2H-1,4-(benz)oxazin-2-ones with diazo compounds or sodium azide yields bi(tri)cyclic compounds which can be converted into [1,2,3]triazoles or 1,5-disubstituted tetrazoles via reactions with nucleophiles as methanol, water and amines.
用重氮化合物或叠氮化钠处理3,(5)-(di)chloro-2 H -1,4-(benz)oxazin-2-ones生成双(三)环化合物,可将其转化为[1,2 ,3]三唑或1,5-二取代的四唑通过与亲核试剂(如甲醇,水和胺)反应。
Synthesis of new 1H-tetrazoles and 1,2,3-triazoles via reactions of 3(,5)-(di)chloro-2H-1,4-(benz)oxazin-2-ones with sodium azide or diazocompounds
作者:Bart P. Medaer、Koen J. Van Aken、Georges J. Hoornaert
DOI:10.1016/0040-4020(96)00423-1
日期:1996.6
diazocompounds to yield bi(tri)cyclic tetrazolo- or triazolo fused intermediates via an intramolecular cyclisation reaction. Conversion of these lactone inter-mediates with various nucleophiles generates new substituted 1H-tetrazoles or 1,2,3-triazoles useful for pharmacological screening and for further elaboration via the α-chloroketone substituent at N-1.
3,5-dichloro-2 H -1,4-oxazin-2-ones和3-chloro-2 H -1,4-benzoxazin-2-ones与叠氮化钠和重氮化合物等双功能试剂反应生成bi(tri环四唑或三唑稠合的中间体通过分子内环化反应。这些内酯中间体与各种亲核试剂的转化产生了新的取代的1 H-四唑或1,2,3-三唑,可用于药理筛选以及通过N-1处的α-氯酮取代基进一步加工。
Functionalisation in position 3 of 3,5-dichloro-2H-1,4-oxazin-2-ones
作者:Koen J. Van Aken、Lieven Meerpoel、Georges J. Hoornaert
DOI:10.1016/s0040-4039(00)79064-2
日期:1992.5
Electrophilic catalysis is shown to give selective substitution of the imidoyl chloride group in 3,5-dichloro-2H-1,4-oxazin-2-ones, avoiding competitive reactions of the nucleophile with the lactone function. With other nucleophiles (SCN-, CH2N2) cyclisations involving the azadiene- or the imine function take place. Cycloaddition of the obtained oxazinones to acetylenic compounds provides polyfunctionalized pyridines.