Substituent effect on di-π-methane reactions of benzopyrazinobarrelenes and benzoquinoxalinobarrelenes
作者:Gary J. Chuang、Chun-Chen Liao
DOI:10.1016/j.tet.2016.01.021
日期:2016.3
To examine the substituenteffect on the di-π-methane (DPM) rearrangement of barrelene-like skeleton, benzopyrazinobarrelene (BPB) and benzoquinoxalinobarrelene (BQB) were utilized as the photoreaction experimental platforms. By the installation of the pyrazine, the DPM reaction was limited to aza-di-π-methane reaction only, in terms of chemoselectivity. The results of the induced regioselectivity
The Diels-Alder reactions of masked omicron-benzoquinones (MOBs) with [60]fullerene, affording novel and highly functionalized bicyclo[2.2.2]-octenone-fused [60]fullerene derivatives, are described.
1,3-Methoxy Rearrangement of Masked <i>o</i>-Benzoquinones: A Novel Synthesis of <i>p</i>-Quinol Ethers
作者:Ching-Shun Yang、Chun-Chen Liao
DOI:10.1021/ol702136r
日期:2007.11.1
p-Quinol ethers are valuable synthons in synthetic organic chemistry. MOBs 1a-1i can be converted to p-quinol ethers 2a-2i in a highly efficient manner via 1,3-methoxy migration catalyzed by Lewis acids. The migration was found to be reversible and dependent on the electronic effect of substituent R3 of MOBs.
Influence of Ring Strain on the Formation of Rearrangement vs Cyclization Isotwistane Products in the Acyl Radical Reaction of Bicyclo[2.2.2]octanone
作者:Chih-Ming Chen、Sheng-Kuo Lin、Chi-Tien Hsieh、Julakanti Satyanarayana Reddy、Yi Ning Teoh、Mu-Jeng Cheng、Hsing-Pang Hsieh
DOI:10.1021/acs.orglett.3c02374
日期:2023.11.3
An acyl radical reaction of bicyclo[2.2.2]octenone to yield either rearranged or cyclized isotwistane products is described. The influence of ring strain on the reaction was demonstrated by alternating the sizes of the fused ring in the starting material. DFT calculations showed that the reaction is under thermodynamic control and proceeds via a 5-exo-trig cyclization intermediate, which undergoes