Hypervalent-iodine(<scp>iii</scp>) oxidation of hydrazones to diazo compounds and one-pot nickel(<scp>ii</scp>)-catalyzed cyclopropanation
作者:Haixuan Liu、Yunyang Wei、Chun Cai
DOI:10.1039/c5nj02378e
日期:——
A one-pot process for the catalytic cyclopropanation of various alkenes with unsubstituted hydrazones is described. Iodosobenzene (PhIO) was found to be a competent oxidant of hydrazones to diazo compounds. Ni(OH)2 was chosen as an effective and cheap metal catalyst. The cyclopropane products can be generated efficiently (5 min–4 h) in moderate to good yields (42–91%) under mild (80 °C) and neat conditions
Effects of Aryl Substituents on Electron-Transfer-Mediated Photochemical Addition of Alcohol to 1,1,2-Triarylcyclopropanes
作者:Hideo Tomioka、Osamu Inoue
DOI:10.1246/bcsj.61.1404
日期:1988.4
Direct irradiation of 1,1,2-triarylcyclopropanes in alcohol resulted in the formation of all possible products arising from trimethylenebiradicals, while DCB-sensitized irradiation gave a novel ”anti-Markownikoff“ addition product of alcohol almost exclusively. In order to get insight into the nature and fate of intermediates in the reactions, the effects of nucelophiles and aryl substituents are
The absolute configuration of cis-2-phenylcyclopropane-carboxylic acid and related compounds
作者:T. Aratani、Y. Nakanisi、H. Nozaki
DOI:10.1016/s0040-4020(01)93018-2
日期:1970.1
in benzene or in the presence of iodine gives(−)-(1R:2R)-trans-1,2-diphenylcyclopropane (7) and(−)- (1R : 2S)-trans-2-phenylcyclopropyliodide (12a), respectively. This establishes the absolute configuration of (+)-3b as 1S :2R. Asymmetrically synthesized (−) -(R)-2-phenylmethylenecyclopropane (24) and (−)-(R)-phenylspiropentane (25) are correlated with (+)-3b through (+)-(1S:2R)-cis-1-methyl-2-phenylcyclopropane
Reactions of Ferrocenylcarbene. III. The Addition Reactions of Some α-Ferrocenylcarbenes to 1,1-Diphenylethylene
作者:Akio Sonoda、Ichiro Moritani
DOI:10.1246/bcsj.43.3522
日期:1970.11
lowest reactivity in additionreactions to the olefin. It has been established by a study of the NMR spectra that, in the ferrocenylcyclopropanes only, there is a restricted rotation about the bond between ferrocenyl and cyclopropyl groups. On this basis, the reactivity of the ferrocenylcarbenes has been discussed in terms of the steric hindrance of the bulky ferrocenyl group.
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.