Nickel-Catalyzed Decarbonyloxidation of 3-Aryl Benzofuran-2(<i>3H</i>)-ones to 2-Hydroxybenzophenones
作者:Zhou Tong、Zhi Tang、Chak-Tong Au、Renhua Qiu
DOI:10.1021/acs.joc.0c00858
日期:2020.7.2
nickel-catalyzed decarbonyloxidation of 3-aryl benzofuran-2(3H)-ones to 2-hydroxybenzophenones under mild conditions, which is an efficient approach for the decarbonyloxidation of lactones in organic synthesis. A diverse range of substrates can undergo C(O)–O/C(O)–C bondcleavage to generate the target products in good yields. These 2-hydroxybenzophenones can be converted into a variety of compounds via reactions
A catalyst-free intermolecular <i>trans</i>-iodoalkylation of alkynes
作者:Jie-Jie Liu、Hong-Yan Huang、Liang Cheng、Qi Liu、Dong Wang、Li Liu
DOI:10.1039/c7ob03159a
日期:——
report the first catalyst-free and trans-selective iodoalkylation reaction of alkynes with a series of α-carbonyl compounds. This unprecedented three-component iodoalkylation reaction is enabled by using (iodoethynyl)trimethylsilane as a radical initiator and iodide source. The 1,2-difunctionalization affords alkenyl iodides, which are versatile building blocks for the construction of tri-substituted
TEMPO promoted direct multi-functionalization of terminal alkynes with 2-oxindoles/benzofuran-2(3<i>H</i>)-one
作者:Qi Liu、Jie-Jie Liu、Liang Cheng、Dong Wang、Li Liu
DOI:10.1039/c8ob01380b
日期:——
Highlyselective and catalyst-free tandem multi-functionalization of terminalalkynes was developed with 2-oxindoles and benzo-furan-2(3H)-one using TEMPO both as a radical promoter and a trapping reagent. This work expands the scope of the radical-cascade addition/trapping process of alkynes for the effective construction of various β-oxyl carbonyls in moderate to good yields.
Palladium-Catalyzed Chemoselective Activation of sp<sup>3</sup> vs sp<sup>2</sup> C–H Bonds: Oxidative Coupling To Form Quaternary Centers
作者:Gang Hong、Pradip D. Nahide、Uday Kumar Neelam、Peter Amadeo、Arjun Vijeta、John M. Curto、Charles E. Hendrick、Kelsey F. VanGelder、Marisa C. Kozlowski
DOI:10.1021/acscatal.9b00091
日期:2019.4.5
activation of alkyl C–H bonds vs arene C–H bonds with Pd(OAc)2 has been found to be generalizable to a number of nucleophilic substrates, allowing the formation of a range of hindered quaternary centers. The substrates share a common mechanistic path wherein Pd(II) initiates an oxidative dimerization. The resultant dimer modifies the palladium catalyst to favor activation of alkyl C–H bonds, in contrast to
Highly Enantioselective Michael Addition Reactions of 3-Substituted Benzofuran-2(3H)-ones to Chalcones Catalyzed by a Chiral Alkyl-Substituted Thiourea
作者:Xin Li、Zhiguo Xi、Sanzhong Luo、Jin-Pei Cheng
DOI:10.1002/adsc.201000106
日期:——
A highlyenantioselectiveMichaeladdition of 3‐substituted benzofuran‐2(3H)‐ones to chalcones catalyzed by a chiralbifunctionalthiourea was developed. Several chiral 3,3′‐substituted benzofuran‐2(3H)‐ones derivatives, bearing adjacent quaternary‐tertiary stereocenters, were efficiently synthesized with excellent enantioselectivities.