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.
Exo/endo selectivity-control in Lewis-acid catalyzed tandem heterocyclization/formal [4+3] cycloaddition: synthesis of polyheterocycles from 2-(1-alkynyl)-2-alken-1-ones and 1,3-diphenylisobenzofuran
作者:Hongyin Gao、Xingxing Wu、Junliang Zhang
DOI:10.1039/c0cc02778b
日期:——
tandem heterocyclization/formal [4+3] cycloaddition was developed, which provides rapid, efficient and stereoselective access to highly fused polyheterocycles from readily available 2-(1-alkynyl)-2-alken-1-ones and 1,3-diphenylisobenzofuran under mild conditions.
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.
Highly Substituted Furo[3,4-<i>d</i>][1,2]oxazines: Gold-Catalyzed Regiospecific and Diastereoselective 1,3-Dipolar Cycloaddition of 2-(1-Alkynyl)-2-alken-1-ones with Nitrones
作者:Feng Liu、Yihua Yu、Junliang Zhang
DOI:10.1002/anie.200901299
日期:2009.7.13
Rapid access: A gold(I)‐catalyzed1,3‐dipolarcycloaddition of 2‐(1‐alkynyl)‐2‐alken‐1‐ones with nitrones provides a practical, regiospecific, and stereoselective access to highlysubstituted fused bicyclic furo[3,4‐d][1,2]oxazines under mild conditions (see scheme). These fused heterobicyclic compounds can be readily converted into furans or 3,6‐dihydro‐2H‐1,2‐oxazines in a chemoselective fashion
快速获得:金(I)催化的2-(1-炔基)-2-烯丙基-1-酮与1,3-偶极环的加成反应,提供对高取代的稠合双环呋喃的实用,区域特异性和立体选择性的访问[ 3,4- [ d ] [1,2]恶嗪在温和的条件下(请参阅方案)。这些稠合的杂环双环化合物可以以化学选择性方式轻易地转化为呋喃或3,6-二氢-2 H -1,2-恶嗪。
Tetrasubstituted Furans by Pd<sup>II</sup>-Catalyzed Three-Component Domino Reactions of 2-(1-Alkynyl)-2-alken-1-ones with Nucleophiles and Vinyl Ketones or Acrolein
作者:Renrong Liu、Junliang Zhang
DOI:10.1002/chem.200901386
日期:2009.9.21
Multicomponent reaction: A novel PdII‐catalyzed three‐component cascade reaction of 2‐(1‐alkynyl)‐2‐alken‐1‐ones with nucleophiles and vinylketones has been developed (see scheme), which provides efficient, general, and atom‐economic access to tetrasubstituted, multifunctionalized furans.