Chemistry of allene sulfoxides: A new synthesis of 1-aryl-3,4-dihydro-1H-[1]benzothieno[3,2-c]pyrans
作者:Neil Edwards、Jacqueline A Macritchie、Philip J Parsons、Michael G.B Drew、Archie W Jahans
DOI:10.1016/s0040-4020(97)00786-2
日期:1997.9
A novel synthesis of 1-aryl-3,4-dihydro-1H-[1]benzothieno[3,2-c]pyrans has been developed, utilising the acid-catalysed cyclisation of 5,6-dihydro-4-phenylsulfinyl-2H-pyrans. Both ring systems could be isolated from suitably substituted allene sulfoxides upon exposure to p-toluenesulfonic acid in refluxing tetrahydrofuran, the nature of the product depending on the reaction time.
利用酸催化的5,6-二氢-4-苯基亚磺酰基-的环化反应,开发了一种新型的1-芳基-3,4-二氢-1 H- [1]苯并噻吩并[3,2- c ]吡喃的合成方法。 2 H-吡喃。当在回流的四氢呋喃中暴露于对甲苯磺酸时,两个环系统都可以从适当取代的烯丙亚砜中分离出来,产物的性质取决于反应时间。