An efficient tandem elimination–cyclization–desulfitative arylation of 2-(gem-dibromovinyl)phenols(thiophenols) with sodium arylsulfinates
作者:Wei Chen、Pinhua Li、Tao Miao、Ling-Guo Meng、Lei Wang
DOI:10.1039/c2ob27232f
日期:——
An efficient tandem eliminationâcyclizationâdesulfitative arylation of 2-(gem-dibromovinyl)phenols(thiophenols) with sodium arylsulfinates has been developed. In the presence of TBAFâPdCl2âCu(OAc)2âNEt3, the reactions generated 2-arylbenzofurans(thiophenes) with good yields in one-pot under ligand-free conditions.
A highly efficient TBAF-promoted intramolecular cyclization of gem-dibromoolefins for the synthesis of 2-bromobenzofurans(thiophenes)
作者:Wei Chen、Yicheng Zhang、Lei Zhang、Min Wang、Lei Wang
DOI:10.1039/c1cc13967c
日期:——
A highlyefficient tetra-(n-butyl)ammonium fluoride (TBAF)-promoted intramolecular cyclization of gem-dibromoolefins has been developed for the synthesis of 2-bromobenzofused heterocycles. The reaction provides a convenient approach to 2-bromobenzofurans(thiophenes) from the corresponding readily available gem-dibromovinyl substrates without a metal.
Intramolecular cross-coupling of gem-dibromoolefins: a mild approach to 2-bromo benzofused heterocycles
作者:Stephen G. Newman、Valentina Aureggi、Christopher S. Bryan、Mark Lautens
DOI:10.1039/b912093a
日期:——
Highly useful halogenated benzofurans and benzothiophenes are prepared from readily available gem-dibromoolefins using a mild, ligand-free copper catalyzed cross-coupling procedure.
A highly efficient one-pot reaction of 2-(gem-dibromovinyl)phenols(thiophenols) with K4Fe(CN)6 to 2-cyanobenzofurans(thiophenes)
作者:Wei Zhou、Wei Chen、Lei Wang
DOI:10.1039/c2ob25356a
日期:——
2-Cyanobenzofurans and 2-cyanobenzothiophenes were prepared through an efficient one-pot Ullmann-reaction/cyanation reaction. In the presence of CuI/Na2CO3–Pd(OAc)2/PPh3 in DMF, the reaction of 2-(gem-dibromovinyl)phenols and 2-(gem-dibromovinyl)thiophenols with K4Fe(CN)6, as non-toxic and user-friendly cyanating reagent, proceeded smoothly to generate the corresponding 2-cyanobenzofurans and 2-cyanobenzothiophenes
通过有效的一锅Ullmann反应/氰化反应制备2-氰基苯并呋喃和2-氰基苯并噻吩。在DMF中CuI / Na 2 CO 3 -Pd(OAc)2 / PPh 3的存在下,2-(宝石-二溴乙烯基)苯酚和2-(宝石-二溴乙烯基)苯硫酚与K 4 Fe(CN)6的反应作为无毒且对用户友好的氰化试剂,该试剂可顺利进行,以高收率生成相应的2-氰基苯并呋喃和2-氰基苯并噻吩。
CLARK P. D.; CLARKE K.; SCROWSTON R. M.; SUTTON T. M., J. CHEM. RES. SYNOP., 1978, NO 1, 10
作者:CLARK P. D.、 CLARKE K.、 SCROWSTON R. M.、 SUTTON T. M.