Synthesis of functionalized benzothiophenes and dibenzothiophenes by twofold Heck and subsequent 6π-electrocyclization reactions of 2,3-dibromothiophenes and 2,3-dibromobenzothiophenes
作者:Serge-Mithérand Tengho Toguem、Imran Malik、Munawar Hussain、Jamshed Iqbal、Alexander Villinger、Peter Langer
DOI:10.1016/j.tet.2012.10.050
日期:2013.1
Benzothiophenes and dibenzothiophenes were prepared by twofold Heck reactions of 2,3-dibromothiophene and 2,3-dibromobenzothiophene, respectively, and subsequent thermal 6π-electrocyclization. The Heck reaction of 2,3-dibromothiophene and 2,3-dibromobenzothiophene with 1 equiv of alkenes proceeded with different regioselectivities and afforded 2-alkenylthiophenes and 3-alkenylbenzothiophenes.
苯并噻吩和二苯并噻吩分别通过2,3-二溴噻吩和2,3-二溴苯并噻吩的两次Heck反应,然后进行热6π-电环化来制备。2,3-二溴噻吩和2,3-二溴苯并噻吩与1当量的烯烃的Heck反应以不同的区域选择性进行,得到2-烯基噻吩和3-烯基苯并噻吩。