Catalytic Intermolecular Pauson−Khand-Type Reaction: Strong Directing Effect of Pyridylsilyl and Pyrimidylsilyl Groups and Isolation of Ru Complexes Relevant to Catalytic Reaction
作者:Kenichiro Itami、Koichi Mitsudo、Kazuyoshi Fujita、Youichi Ohashi、Jun-ichi Yoshida
DOI:10.1021/ja047484+
日期:2004.9.1
Some circumstantial evidence for the directing effect of the 2-pyridylsilyl group in the Ru-catalyzed intermolecular Pauson-Khand-type reaction (PKR) of alkenyl(2-pyridyl)silane, alkyne, and carbon monoxide has been provided. Most importantly, we have succeeded in isolating several monometallic Ru complexes relevant to the catalytic reaction: Ru(vinylsilane)(CO)(3) complexes and ruthenacyclopentene. While the stoichimetric reaction of the Ru(vinylsilane)(CO)(3) complex with an alkyne led to the formation of the corresponding cyclopentenone (PKR product) at 100 degreesC, the ruthenacyclopentene intermediate was quantitatively produced at 50 degreesC. This complex was also converted to a cyclopentenone upon heating at 100 degreesC. Moreover, it was also found that the Ru(vinylsilane)(CO)(3) complex and ruthenacyclopentene serve as catalysts in intermolecular PKR.
Rh-catalyzed reagent-free ring expansion of cyclobutenones and benzocyclobutenones
作者:Peng-hao Chen、Joshua Sieber、Chris H. Senanayake、Guangbin Dong
DOI:10.1039/c5sc01875g
日期:——
A reagent-free Rh-catalyzed ring-expansion reaction via C–C cleavage of cyclobutenones and benzocyclobutenones is reported.
报道了一种无试剂的Rh催化的环扩张反应,通过对环丁酮和苯并环丁酮进行C-C键裂解。
Agents for the Treatment of Overactive Detrusor. VII. Synthesis and Pharmacological Properties of 2,3- and 3,4-Diphenylcyclopentylamines, 2,3-Diphenyl-2-cyclopentenylamines, and Related Compounds.
of our search for new agents for the treatment of overactive detrusor, 2,3- and 3,4-diphenylcyclopentylamines (3), 2,3-diphenyl-2-cyclopentenylamines (4), and related compounds (5 and 18) were synthesized and evaluated for inhibitory activity (i.v.) against urinary bladder rhythmic contraction in rats. Among them, some compounds involving N-tert-butyl-2,3-diphenyl-2-cyclopentenylamine (4b) exhibited