Dynamic Covalent Chemistry of Disulfides Offers a Highly Efficient Synthesis of Diverse Benzofused Nitrogen−Sulfur Heterocycles in One Pot
摘要:
The thiol-disulfide dynamic interchange reaction mediated by 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) was extensively studied. By this synthetic method sulfides can be prepared successfully within seconds in high yields at room temperature from stable and readily available disulfides and an alkylating agent. The method was further demonstrated to efficiently produce benzofused nitrogen-sulfur heterocycles with high skeletal diversity in a one-pot process.
Dynamic Covalent Chemistry of Disulfides Offers a Highly Efficient Synthesis of Diverse Benzofused Nitrogen−Sulfur Heterocycles in One Pot
作者:Ning Zhu、Fa Zhang、Gang Liu
DOI:10.1021/cc100042v
日期:2010.7.12
The thiol-disulfide dynamic interchange reaction mediated by 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) was extensively studied. By this synthetic method sulfides can be prepared successfully within seconds in high yields at room temperature from stable and readily available disulfides and an alkylating agent. The method was further demonstrated to efficiently produce benzofused nitrogen-sulfur heterocycles with high skeletal diversity in a one-pot process.
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,