PdCl<sub>2</sub>-Promoted Electrophilic Annulation of 2-Alkynylphenol Derivatives with Disulfides or Diselenides in the Presence of Iodine
作者:Hui-Ai Du、Xing-Guo Zhang、Ri-Yuan Tang、Jin-Heng Li
DOI:10.1021/jo9016309
日期:2009.10.16
of 3-chalcogen-benzo[b]furans via palladium-promoted annulation reactions of 2-alkynylphenol derivatives with disulfides or diselenides and iodide has been developed. In the presence of I2 and PdCl2, both 3-sulfenylbenzofurans and 3-selenenylbenzofurans were selectively prepared from the cyclization of 2-alkynyanisoles with disulfides or diselenides in moderate to excellent yields.
通过2-炔基苯酚衍生物与二硫化物或二硒化物和碘化物的钯促进的环化反应,已开发出有效合成3-硫属元素-苯并[ b ]呋喃的方法。在I 2和PdCl 2的存在下,由2-炔基吲哚与二硫化物或二硒化物的环化反应选择性地制备了3-亚磺酰基苯并呋喃和3-硒烯苯并呋喃,且产率中等至优异。
Convergent total synthesis of lamellarin K†
作者:Martin Banwell、David Hockless
DOI:10.1039/a705874h
日期:——
The azomethine ylide derived from dihydroisoquinolinium salt 24 undergoes an intramolecular [3 + 2] cycloaddition reaction to give pyrrole 25 which upon de-isopropylation affords the marine alkaloid lamellarin K 4.
A Concise Route to Dihydrobenzo[<i>b</i>]furans: Formal Total Synthesis of (+)-Lithospermic Acid
作者:Joshua Fischer、G. Paul Savage、Mark J. Coster
DOI:10.1021/ol201130h
日期:2011.7.1
benzofuran reduction (Mg, MeOH, NH4Cl) provides a convergent and modular synthetic route to trans-2-aryl-2,3-dihydrobenzo[b]furan-3-carboxylates, which are a structural feature of numerous biologically active natural products. This versatile strategy was applied to the formal total synthesis of the anti-HIV natural product (+)-lithospermic acid.
Sonogashira偶联,Pd(II)催化的羰基环化和苯并呋喃还原(Mg,MeOH,NH 4 Cl)的序列为反式-2-芳基-2,3-二氢苯并[ b ]呋喃提供了一种收敛的模块化合成途径。-3-羧酸盐,是许多具有生物活性的天然产物的结构特征。这种多用途的策略适用于抗HIV天然产物(+)-紫精酸的正式全合成。
Alkoxyboration: Ring-Closing Addition of B–O σ Bonds across Alkynes
作者:Joshua J. Hirner、Darius J. Faizi、Suzanne A. Blum
DOI:10.1021/ja500463p
日期:2014.3.26
reaction, the addition of boron–oxygen σ bonds to alkynes. Functionalized O-heterocyclic boronic acid derivatives are produced using this transformation, which is mild and exhibits broad functional group compatibility. Our results demonstrate activation of this boron–O σ bond using a gold catalysis strategy that is fundamentally different from that used previously for other boron addition reactions.
Nickel‐Catalyzed Acyl Group Transfer of
<i>o‐</i>
Alkynylphenol Esters Accompanied by C−O Bond Fission for Synthesis of Benzo[
<i>b</i>
]furan
作者:Ryohei Doi、Koji Shimizu、Yuma Ikemoto、Masashi Uchiyama、Mikiko Koshiba、Atsushi Furukawa、Katsumi Maenaka、Satoshi Watanabe、Yoshihiro Sato
DOI:10.1002/cctc.202001949
日期:2021.4.21
Herein, we report the nickel‐catalyzed cascade C−O bond cleavage/cyclization of ortho‐alkynylphenyl ester to construct a 3‐acylbenzo[b]furan skeleton. As a result of reaction condition screening, the Ni(0)/IAd (1,3‐Di(1‐adamantyl)imidazole‐2‐ylidene) system was found to be optimal for catalytic conversion. Interestingly, the reaction exclusively gives 3‐acylbenzo[b]furan instead of a decarbonylated
在此,我们报道了邻炔基苯基酯的镍催化级联C-O键裂解/环化反应,以构建3-酰基苯并[ b ]呋喃骨架。反应条件筛选的结果是,发现Ni(0)/ IAd(1,3-Di(1-金刚烷基)咪唑-2-亚基)体系最适合催化转化。有趣的是,该反应仅生成3-酰基苯并[ b用呋喃代替在羰基镍物种介导的反应中经常观察到的脱羰基产物。催化剂的负载量可以降低到5-10 mol%。我们证明了各种功能化的3酰基苯并呋喃衍生物的合成。我们进行了镍配合物的化学计量研究以及密度泛函理论(DFT)计算,以支持可能的反应机理。