Thermal reactions of cyclopropenone ketals. Key mechanistic features and scope of the cycloaddition reactions of delocalized singlet vinylcarbenes: three-carbon 1,1-/1,3-dipoles
Thermal reactions of cyclopropenone ketals. Key mechanistic features and scope of the cycloaddition reactions of delocalized singlet vinylcarbenes: three-carbon 1,1-/1,3-dipoles
Effective, thermal one-carbon + two-carbon cycloaddition of cyclopropenone ketals with electron-deficient olefins: Cyclopropane formation.
作者:Dale L. Boger、Christine E. Brotherton
DOI:10.1016/s0040-4039(01)91393-0
日期:1984.1
Treatment of olefinsbearing one electron-withdrawingsubstituent with cyclopropenone ketals under mild, thermal conditions provide cyclopropane products.
在温和的热条件下用环丙烯酮缩酮处理带有一个吸电子取代基的烯烃,得到环丙烷产物。
Synthesis and characterization of tungsten oxo alkylidene complexes via the reaction of WCl2(O)[PX3]3 (PX3 P(OMe)3, PMe2Ph, PMePh2) with 4,8-dioxaspiro[2,5]oct-1-ene (ketalcyclopropene)
作者:F. Javier de la Mata
DOI:10.1016/s0022-328x(96)06493-5
日期:1996.11
This paper describes the synthesis and characterization of the first tungsten oxo ketalvinyl alkylidenecomplexes via the reaction of WCl2 (O)[PX3]3 (PX3 P(OMe)3 1, PMe2Ph 2, PMePh2 3 4,8-dioxaspiro[2,5]oct-1-ene (ketalcyclopropene). Complex 1 reacts with ketalcyclopropene affording almost quantitatively the corresponding s-cis-vinyl alkylidenecomplex W(CHCHCR(Cl2(O)[P(OMe)3] 4 (RCOCH2CH2CH2O−)
Grubbs ruthenium complex efficiently catalyses ring opening cross metathesis of cyclopropenone ketal and terminal olefins to afford 1,4-divinyl ketone ketals in good yields.
Highly Diastereo- and Regioselective Transition Metal-Catalyzed Additions of Metal Hydrides and Bimetallic Species to Cyclopropenes: Easy Access to Multisubstituted Cyclopropanes
The first highly efficient, diastereo- and regioselective transition metal-catalyzed addition of metal hydrides (stannanes, silanes, and germanes) and bimetallic species (ditins and silyltins) to cyclopropenes has been developed. It was shown that the addition across the double bond of cyclopropenes is generally controlled by steric factors and proceeds from the least hindered face. This methodology
General synthesis of cyclopropenones and their acetals
作者:Masahiko Isaka、Satoshi Ejiri、Eiichi Nakamura
DOI:10.1016/s0040-4020(01)88873-6
日期:——
Metalated cyclopropenone acetals 5 react with a variety of electrophiles, including alkyl halides, carbonylcompounds, vinyl iodides, vinyl triflates, and aryl iodides, to give substituted cyclopropenone acetals in high yield. Hydrolysis of the acetal under acidic conditions gives the corresponding cyclopropenone. The reaction sequence has realized an efficient synthesis of an antibiotic penitricin