Bicycloannulation leading to the tricyclo[4.4.0.01,5]decane framework and its congeners
作者:Hisahiro Hagiwara、Futoshi Abe、Hisashi Uda
DOI:10.1039/c39910001070
日期:——
Reactions of the kinetic enolates of 1-acetylcyclohexenes with α-bromo-α,β-unsaturated esters afford 5-methoxycarbonyltricyclo[4.4.0.01,5]decan-2-ones in one pot syntheses via successive Michael–Michael-substitution reactions.
All non-H atoms in the two identical molecules of the title compound, C12H14O3, lie on a crystallographic mirror plane, except for C2 and C3, which lie equally above and below the plane by approximately 0.4 Angstrom. Intermolecular hydrogen bonds between the phenol group and the carboxylate O atom link the molecules into chains which lie along the a axis.
The tandem intermolecular Paternò–Büchi reaction: formation of tetrahydrooxepins
作者:Chee Yong Gan、John N. Lambert
DOI:10.1039/a802922i
日期:——
[2 + 2] photocycloaddition between carbonyl compounds and electron rich alkenes to generate oxetane products. By the introduction of substituted cyclopropyl rings to the alkene components, the utility of this reaction has been extended to facilitate the synthesis of substituted tetrahydrooxepins. It is proposed that initial addition of oxygen radicals to cyclopropyl enol ethers generates cyclopropylmethyl