An X<sup>-</sup> (X = I, Br)-Triggered Ring-Opening Coupling Reaction of Cyclopropenes with Organic Halides
作者:Shengming Ma、Junliang Zhang、Yangjun Cai、Lianghua Lu
DOI:10.1021/ja038131y
日期:2003.11.1
Polyfunctionalized (E)-alk-1-enyl halides 3 were efficiently synthesized in high yields via a novel regio- and stereoselective X- (X = I or Br)-triggered ring-opening couplingreaction of cyclopropenes 1 with organic halides 2.
Synthesis of pyrazolo[5,1-a]isoquinolines via silver(i)–rhodium(i) cooperative catalysis in the reaction of N′-(2-alkynylbenzylidene)hydrazide with cycloprop-2-ene-1,1-dicarboxylate
作者:Liangqing Yao、Xingxin Yu、Chen Mo、Jie Wu
DOI:10.1039/c2ob26824h
日期:——
A tandemreaction between N′-(2-alkynylbenzylidene)hydrazide and cycloprop-2-ene-1,1-dicarboxylate co-catalyzed by silver triflate and tris(triphenylphosphine)rhodium chloride is reported. The reaction proceeds through 6-endo-cyclization, [3 + 2] cycloaddition, cyclopropane opening, and aromatization, leading to pyrazolo[5,1-a]isoquinolines in moderate to good yields.
N '-(2-炔基亚苄基)酰肼与环丙-2-烯-1,1-二羧酸酯共催化下的串联反应三氟甲磺酸银报道了三(三苯基膦)氯化铑。该反应通过6-内-cyclization,[3 + 2]环加成,环丙烷打开并进行芳构化,导致吡唑并[5,1- a ]异喹啉的产量适中至良好。
From Cyclopropenes to Tetrasubstituted Furans: Tandem Isomerization/Alkenylation Sequence with Cu/Pd Relay Catalysis
Pon de relay: A convenient and efficient synthesis of alkene‐functionalized furansfromcyclopropenes, which proceeds through an isomerization/olefination cascade sequence under copper–palladium relaycatalysis, has been developed (see scheme).
Pon de relay:已经开发了一种方便有效的方法,从环丙烯中合成烯烃官能化的呋喃,该过程在铜-钯中继催化下通过异构化/烯化级联序列进行(参见方案)。
Copper(I)-Catalyzed Carbometalation of Nonfunctionalized Cyclopropenes Using Organozinc and Grignard Reagents
作者:Kohei Endo、Takeo Nakano、Yutaka Ukaji
DOI:10.1055/s-0034-1379959
日期:——
A highly efficient method was developed for the copper(I)-catalyzed carbometalation of various nonfunctionalized and functionalized cyclopropenes. Electrophilic trapping of the cyclopropylmetal intermediates gave multifunctionalized cyclopropanes.
With the goal of accessing yet unknown SF5-cyclopropyl building blocks, the radical addition of SF5Cl to cyclopropenes was investigated. Addition of the SF5 radical occurs regioselectively at the less substituted carbon of cyclopropenes and trans to the most hindered substituent at C3, while chlorine atom transfer proceeds with moderate to high levels of diastereocontrol. The carbon–chlorine bond in