Hydrostannation of Cyclopropene. Strain-Driven Radical Addition Reaction
作者:Shigeru Yamago、Satoshi Ejiri、Eiichi Nakamura
DOI:10.1246/cl.1994.1889
日期:1994.10
cyclopropenone acetals with trialkyltinhydride takes place smoothly under radical conditions to afford a variety of 2-alkyl-3-stannylcyclopropanone acetals in high yield. Comparison of the cyclopropene with acetylenes with the aid of inter- and intramolecular competitive experiments revealed the kinetically controlled nature of the reaction of the cyclopropene reaction.
[reaction: see text] Substituted cyclopentadienone acetals (CPDAs) were synthesized by a thermal or palladium-catalyzed [3 + 2] cycloadditionreaction of a substituted cyclopropenone acetal to an electron-deficientacetylene. The synthesis afforded di-, tri-, and tetra-substituted CPDAs of considerable structural varieties that undergo Diels-Alder reaction to produce bicyclo[2.2.1]heptenes.