A Breakthrough for the Photochemical Arylation in the 3-(Phenylmethyl)-2(5H)-furanone system Leading to the Tetrahydroindenofuranone System
摘要:
The photochemistry of the 'central methane'-substituted 3-benzyl-2(5H)-furanone system (1) is described. Despite its di-pi-methane structure, photochemical arylation was found to predominate in place of the di-pi-methane rearrangement, and gave substituted tetrahydroindenofuranones (2) in good yields.
Transition state mimicry is one of the most powerful concepts in enzyme inhibitor design and has led to the development of catalytic antibodies. Transition state analogs are compounds with a fixed shape that resemble the geometry and charge distribution of the transition state of a given reaction. Stabilization of a transition state like conformation is most often achieved by incorporating a ring system
The effect of substitution at the 'central methane' on the photoreactivity of 3-benzylfuran-2(5H)ones 5a-g was investigated. Despite its di-pi-methane structure, photochemical arylation was effected to give substituted indenofuranones 6 in good yields. Only the substitution by phenyl caused the di-pi-methane rearrangement to give a cyclopropanofuranone 18g in moderate yield.
Accentuation of the Di-p-Methane Reactivity by Central Carbon Substitution in the 4-(Phenylmethyl)-2(5H)-furanone System
作者:Osamu Muraoka、Genzoh Tanabe、Takefumi Momose
DOI:10.3987/com-90-5502
日期:——
MURAOKA, OSAMU;TANABE, GENZOH;MOMOSE, TAKEFUMI, HETEROCYCLES, 31,(1990) N, C. 1589-1592
作者:MURAOKA, OSAMU、TANABE, GENZOH、MOMOSE, TAKEFUMI
DOI:——
日期:——
Unexpected Novel Rearrangement Reaction: Synthesis of Benzo‐Medium‐Ring Anhydride
(E)‐3‐(benzo[d][1,3]dioxol‐5‐ylmethylene)‐4‐(propan‐2‐ylidene)‐dihydrofuran‐2,5‐dione, we found a novel rearrangement and obtained the unexpected compound that is assigned as benzo‐medium‐ring anhydride instead of the expected compound. We described the novel rearrangement and a potential method for the synthesis of benzo‐medium‐ring anhydride derivatives.