Highly Substituted 2,3-Dihydroisoxazoles by Et<sub>3</sub>N-Catalyzed Tandem Reaction of Electron-Deficient 1,3-Conjugated Enynes with Hydroxylamines
作者:Xiuzhao Yu、Bo Du、Kai Wang、Junliang Zhang
DOI:10.1021/ol100490y
日期:2010.4.16
reaction of electron-deficient 1,3-conjugated enynes with hydroxylamines was developed which provided rapid, metal-free, and regioselective access to highly substituted multifunctionalized 2,3-dihydroisoxazoles under mild conditions. The reactions of 3-(2-arylethynyl)-4H-chromen-4-ones with hydroxylamines afford β-amino enones under the same reaction conditions.
Cationic Rhodium(I)-Catalyzed Regioselective Tandem Heterocyclization/[3+2] Cycloaddition of 2-(1-Alkynyl)-2-alken-1-ones with Alkynes
作者:Hongyin Gao、Junliang Zhang
DOI:10.1002/chem.201103924
日期:2012.3.5
RhI in two minds: A RhI‐catalyzed tandem heterocyclization/[3+2] cycloaddition reaction was developed that provides rapid, efficient, and stereoselective access to highly substituted cyclopenta[c]furans from readily available 2‐(1‐alkynyl)‐2‐alken‐1‐ones and alkynes (see scheme). The cationic RhI acts as both a Lewis acid and a conventional transition‐metal catalyst, providing the first example of
Tetrasubstituted allenes by Pd0-catalyzed three-component tandem Michael addition/cross-coupling reaction
作者:Yuanjing Xiao、Junliang Zhang
DOI:10.1039/b919060k
日期:——
A Pd(0)-catalyzed three-component tandem Michaeladdition/cross-couplingreaction of electron-deficient enynes with nucleophiles and aryl halides was developed, which provides general, efficient, and regioselective access to multi-functionalized tetra-substituted allenes.
Tetrasubstituted furans by PdII/CuI-cocatalyzed three-component domino reactions of 2-(1-alkynyl)-2-alken-1-ones, nucleophiles and diaryliodonium salts
作者:Wenbo Li、Junliang Zhang
DOI:10.1039/c0cc03450a
日期:——
A novel Pd(OAc)(2)/CuI-cocatalyzed three-componentreaction of 2-(1-alkynyl)-2-alken-1-ones, nucleophiles and diaryliodonium salts has been developed. The procedure allows the synthesis of tetrasubstitutedfurans in good to high yields under mild conditions.
Regioselective Addition of Organometallic Reagents to 2-(1-Alkynyl)-2-alken-1-ones for an Efficient Synthesis of Substituted 1,2-Allenyl Ketones
作者:Xiuzhao Yu、Junliang Zhang
DOI:10.1002/adsc.201100009
日期:2011.5
Highly substituted 1,2‐allenyl ketones can be easily and efficiently prepared fromorganometallicreagents and readily available 2‐(1‐alkynyl)‐2‐alken‐1‐ones. The synthetic application of 1,2‐allenyl ketone products was also showcased by palladium‐catalyzed further transformation.