A NEW METHOD FOR DIRECT OXIDATION OF THE METHYLENE GROUP ADJACENT TO A CYCLOPROPANE RING TO THE KETO GROUP
作者:Takashi Hasegawa、Haruki Niwa、Kiyoyuki Yamada
DOI:10.1246/cl.1985.1385
日期:1985.9.5
A new finding that the methylene group adjacent to a cyclopropane ring can be oxidized to the keto group directly with ruthenium tetroxide is described.
描述了与环丙烷环相邻的亚甲基可以直接用四氧化钌氧化成酮基的新发现。
3α-Acetoxy-6,6-dimethylbicyclo[3.1.1]heptane-2-spiro-1′-cyclopropane from nopylamine deamination
作者:Raymond J. Abraham、Richard Jones-Parry、Rodney M. Giddings、Jonathan Guy、David Whittaker
DOI:10.1039/a707911g
日期:——
Deamination of nopylamine hydrochloride with sodium nitrite in acetic acid yields nopyl chloride 8, nopyl acetate 1 (R = OAc), 2-(1-acetoxyethyl)-6,6-dimethylbicyclo[3.1.1]hept-2-ene 9 and 3α-acetoxy-6,6-dimethylbicyclo[3.1.1]heptane-2-spiro-1â²-cyclopropane 12. The products are consistent with initial formation of a diazonium ion which reacts by nucleophilic attack, hydride shift or by shift of electrons of the double bond. The reaction is contrasted with the acetolysis of nopyl toluene-p-sulfonate, which yields 8,8-dimethyltricyclo[4.2.1.03,7]nonan-6-ol as the main product. The difference is suggested to result from the transition state being reached early (deamination) or late (toluene-p-sulfonate acetolysis) on the reaction coordinate.
Bessiere-Chretien,Y.; El Gaied,M.M., Bulletin de la Societe Chimique de France, 1971, p. 2189 - 2194
作者:Bessiere-Chretien,Y.、El Gaied,M.M.
DOI:——
日期:——
Role of cyclopropanes as activating groups during oxidation reactions with RuO4 generated in situ
作者:Jean Luc Coudret、Stephan Zöllner、Bart Jan Ravoo、Lionnel Malara、Christian Hanisch、Klaus Dörre、Armin de Meijere、Bernard Waegell
DOI:10.1016/0040-4039(96)00325-5
日期:1996.4
Rutheniumtetroxide generated in situ under the Sharpless conditions was applied to different hydrocarbons containing cyclopropane groups either spiroanellated or ring-fused. In all cases oxidation occurred exclusively at the positions α to the cyclopropyl group to give ketones. Ring cleavage was observed when such positions were tertiary.