Regioselective Pd(0)-Catalyzed Hiyama Cross-Coupling Reactions at Dihalo-Substituted Heterocycles
作者:Thorsten Bach、Stefan Schweizer
DOI:10.1055/s-0029-1218528
日期:2010.1
The regioselectivity of the Hiyama cross-coupling reaction at various dihalo-substituted heterocycles has been studied. Methyl 2,3-dibromo-5-furancarboxylate and n-octyltrifluorosilane were employed to find optimum reaction conditions [CsF; Pd2dba3/P(2-furyl)3 as catalyst, 80-150 ËC in toluene or benzene] for the desired transformation. Subsequent experiments with the title compounds and with different primary alkyltrifluorosilanes illustrate the generality of this regiochemical process.
Novel and Selective Palladium-Catalyzed Annulations of 2-Alkynylphenols To Form 2-Substituted 3-Halobenzo[<i>b</i>]furans
作者:Yun Liang、Shi Tang、Xu-Dong Zhang、Li-Qiu Mao、Ye-Xiang Xie、Jin-Heng Li
DOI:10.1021/ol060908f
日期:2006.7.1
[reaction: see text] A novel and selective palladium-catalyzed annulation of 2-alkynylphenols method for the synthesis of 2-substituted 3-halobenzo[b]furans is presented. In the presence of PdX(2), CuX(2), and HEt(3)NX, 2-substituted 3-halobenzo[b]furans were selectively obtained as the major products. The mechanism of the reaction was also discussed.
Photochromism of 1,2-Bis(2-alkyl-1-benzofuran-3-yl)perfluorocyclopentene Derivatives
作者:Tadatsugu Yamaguchi、Masahiro Irie
DOI:10.1002/ejoc.200600011
日期:2006.7
[reaction: see text] Photochromic diarylethene derivatives having benzofuran heteroaryl groups, bis(2-methyl-1-benzofuran-3-yl)perfluorocyclopentene and bis(2-butyl-1-benzofuran-3-yl)perfluorocyclopentene, were synthesized, and their photochromic performance was examined in hexane solution as well as in the single-crystalline phase. The compounds exhibited photochromic reactivity even in the single-crystalline