细菌双加氧酶催化的四环芳烃的顺式-二羟基化苯并[ c ]菲 2,与等构化合物苯并[ b ]萘[1,2 -d ]呋喃 8和苯并[ b ]萘并[1,2- d ]噻吩 已经发现,图9中仅出现在峡湾地区的债券上。将得到的顺式-dihydrodiols 7,10和11被发现是对映体纯类似的绝对构型和。在8,9,10,11-四氢前体(12和13)的假峡湾区还观察到顺-二羟基化。苯并[ b ]萘[1,2- d ]呋喃 8和苯并[ b ]萘并[1,2- d ]噻吩 参见图9,得到相应的对映纯六氢顺式二醇14和15。一种新型串联顺二羟基化和四氢基板的双-去饱和,四氢苯并[ b ]萘并[1,2- d ]噻吩13,通过催化联苯双加氧酶,发现得到峡湾区域顺-dihydrodiol 17的苯并[ b ]萘并[1,2- d ]噻吩 9。
Reported here is the direct synthesis of naphthofurans and benzofurans from readily available phenols and α-haloketones promoted by titanium tetrachloride which combines Friedel–Crafts-like alkylation and intramolecular cyclodehydration into one step. This simple protocol allows for the formation of a variety of high value naphthofurans and benzofurans within which a series of cyclic and acyclic groups
for the diversifiedsynthesis of furans and arenofurans has been developed that proceeds through K2CO3‐promoted cyclization between enols/1,3‐dicarbonyl compounds and nitroolefins at reflux in EtOH. This facile method has been successfully employed in the synthesis of benzotrifuran derivatives, which are useful hole‐transporting materials. This procedure also provides directaccess to dioxa[5]helicenes
已经开发了一种多样化合成呋喃和槟榔呋喃的通用方法,该方法通过在EtOH中回流,通过K 2 CO 3促进烯醇/ 1,3-二羰基化合物与硝基烯烃之间的环化反应来进行。这种简便的方法已成功用于苯并三呋喃衍生物的合成,苯并三呋喃衍生物是有用的空穴传输材料。该程序还提供了直接接触二氧杂[5]螺旋的方法。该反应提供了广泛的底物范围,使用了廉价的碱和对环境无害的溶剂,并且操作简单。
Titanium tetrachloride promoted cyclodehydration of aryloxyketones: Facile synthesis of benzofurans and naphthofurans with high regioselectivity
An efficient and facile method for the synthesis of a broad series of benzofurans and naphthofurans is described. The direct intramolecular cyclodehydration of aryloxyketones in the presence of titaniumtetrachloride affords the corresponding benzofurans and naphthofurans with good regioselectivity and yields.