2-亚芳基-3,4-二氢-4-羟基-3-氧代-2H-1,4-苯并噻嗪异羟肟酸(VI)最好通过还原α-(邻硝基苯硫基)肉桂酸酯和一般的相关化合物来制备。结构 V 与硼氢化钠和钯-木炭。这些前体 (V) 是通过(邻硝基苯硫基)乙酸甲酯及其简单衍生物与多种芳基醛在哌啶存在下反应获得的。当以无水甲醇或乙醇为溶剂时,尝试以类似方式从(邻硝基苯磺酰基)乙酸甲酯或乙酯制备 V 的砜在两种情况下是成功的。另一种反应,其中一分子醛与两分子(邻硝基苯磺酰基)乙酸酯缩合。(2-硝基苯磺酰基)乙酸甲酯和乙酯及其简单的环取代衍生物通过加热乙酸在含有哌啶的水溶液中的溶液顺利水解和脱羧。甲基对硝基苯砜同样...
Organic sulfur compounds. V. The preparation of some benzothiazine hydroxamic acids
作者:R. T. Coutts、Elizabeth M. Smith
DOI:10.1139/v67-162
日期:1967.5.1
compounds of general structure V with sodium borohydride and palladium–charcoal. These precursors (V) were obtained by reacting methyl (o-nitrophenylthio)acetate and its simple derivatives with a variety of aryl aldehydes, in the presence of piperidine. Attempts to prepare the sulfones of V in a similar manner from methyl or ethyl (o-nitrobenzenesulfonyl)acetate were successful in two instances when
2-亚芳基-3,4-二氢-4-羟基-3-氧代-2H-1,4-苯并噻嗪异羟肟酸(VI)最好通过还原α-(邻硝基苯硫基)肉桂酸酯和一般的相关化合物来制备。结构 V 与硼氢化钠和钯-木炭。这些前体 (V) 是通过(邻硝基苯硫基)乙酸甲酯及其简单衍生物与多种芳基醛在哌啶存在下反应获得的。当以无水甲醇或乙醇为溶剂时,尝试以类似方式从(邻硝基苯磺酰基)乙酸甲酯或乙酯制备 V 的砜在两种情况下是成功的。另一种反应,其中一分子醛与两分子(邻硝基苯磺酰基)乙酸酯缩合。(2-硝基苯磺酰基)乙酸甲酯和乙酯及其简单的环取代衍生物通过加热乙酸在含有哌啶的水溶液中的溶液顺利水解和脱羧。甲基对硝基苯砜同样...
ORGANIC SULFUR COMPOUNDS: PART I. BENZOTHIAZINE HYDROXAMIC ACIDS AND RELATED COMPOUNDS
作者:R. T. Coutts、H. W. Peel、Elizabeth M. Smith
DOI:10.1139/v65-449
日期:1965.12.1
2H-1,4-Benzothiazine hydroxamic acids of type V (see Table I) are readily prepared by reducing suitably substituted (o-nitrophenylthio)acetates (II, R″ = Me or Et) by means of sodium borohydride and palladium–charcoal. The ester precursors can be prepared by the interaction of o-nitrothiophenols and α-bromoesters, but such a method is limited in scope. Diethyl bromomalonate, for example, reacts atypically
V 型 2H-1,4-苯并噻嗪异羟肟酸(见表 I)可通过硼氢化钠和钯-木炭还原适当取代的(邻硝基苯硫基)乙酸盐(II,R″ = Me 或 Et)来制备。酯前体可以通过邻硝基苯硫酚和α-溴酯的相互作用来制备,但这种方法的范围有限。例如,溴丙二酸二乙酯与邻硝基苯硫酚的反应异常。酯前体通过相应酸的 Fischer-Speier 酯化 (II, R" = H) 更好地制备,而这些酸又是 α-巯基酸对合适的邻氯-(或溴-)硝基苯进行亲核攻击的产物. 这种通用的制备方法在两种情况下都失败了。邻氯硝基苯或4-氯-3-硝基甲苯与α-巯基异丁酸反应时,