Pd(II)-catalyzed C–H functionalization of nondirected arenes has been realized using an inexpensive and easily accessible type of bidentate S,O-ligand. The catalytic system shows high efficiency in the C–Holefination reaction of electron-rich and electron-poor arenes. This methodology is operationally simple, scalable, and can be used in late-stage functionalization of complex molecules. The broad
Stereoselective Synthesis of Unsymmetrical β,β-Diarylacrylates by a Heck−Matsuda Reaction: Versatile Building Blocks for Asymmetric Synthesis of β,β-Diphenylpropanoates, 3-Aryl-indole, and 4-Aryl-3,4-dihydro-quinolin-2-one and Formal Synthesis of (−)-Indatraline
作者:Jason G. Taylor、Carlos Roque D. Correia
DOI:10.1021/jo102134v
日期:2011.2.4
in the asymmetric Cu-catalyzed 1,4 reduction reaction to provide β,β-diarylpropanoates in high enantioselectivities. The synthesis of a 3-aryl indole and a chiral 4-aryl-2-quinolone from β,β-diarylacrylates was achieved by cyclization in the presence of a diphosphine ligated CuH catalyst. A convenient route for the asymmetric formal synthesis of the psychoactive compound (−)-Indatraline is also presented
Nondirected Pd-Catalyzed C–H Perdeuteration and <i>meta</i>-Selective Alkenylation of Arenes Enabled by Pyrazolopyridone Ligands
作者:Seo Jin Yun、Jisu Kim、Eunsu Kang、Hoimin Jung、Hyun Tae Kim、Minkyu Kim、Jung Min Joo
DOI:10.1021/acscatal.2c06303
日期:——
of the C–H bonds implies that site selectivity is determined during the migratory insertion step in the alkenylation reaction, thereby preferentially functionalizing the meta-positions rather than the typically more reactive ortho- and para-positions of anisole derivatives. Further, the electronic and structural properties of the pyrazole moiety provide flexibility in the ligand binding to Pd, enabling
versatile building blocks in many fields, including the synthesis of biologically active compounds. Here, we report the light-driven intramolecular cyclopropanation of alkene-tethered N-tosylhydrazones in the presence of Cs2CO3 and visible light. We have synthesized various electronically and sterically substituted and heterocyclic-containing fused-(spiro)cyclopropane γ-lactone compounds in good yields under
含稠合环丙烷环的γ-内酯化合物是许多领域的通用结构单元,包括生物活性化合物的合成。在这里,我们报道了在 Cs 2 CO 3和可见光存在下,烯烃束缚的N-甲苯磺酰腙的光驱动分子内环丙烷化反应。我们采用无自由基方法,在无过渡金属的条件下以良好的收率合成了各种电子和空间取代且含杂环的稠合-(螺)环丙烷γ-内酯化合物。此外,还介绍了从α-酮酯一锅法合成稠合环丙烷γ-内酯及其合成实用性。