Photochemical formation and decomposition of 8-[β-arylethenyl]-2,2,6-trimethyl-7,9,10-trioxa-tricyclo[6.2.2.01,6]dodec-11-ene to novel 6-hydroxy-1,7,7-trimethyl-2-oxa-bicyclo[4.4.0]dec-4-en-3-one in the presence of oxygen
作者:Vishal Sharma、Vivek Gupta、Sumati Anthal、Ajit K. Saxena、Mohan Paul S. Ishar
DOI:10.1016/j.tetlet.2012.08.028
日期:2012.10
Irradiation of (E,E)-arylidene-β-ionones in the presence of oxygen leads to the formation of 8-[β-arylethenyl]-2,2,6-trimethyl-7,9,10-trioxa-tricyclo[6.2.2.01,6]dodec-11-enes (3). However, prolonged irradiation in the presence of oxygen leads to their conversion to 6-hydroxy-1,7,7-trimethyl-2-oxa-bicyclo[4.4.0]dec-4-en-3-one (4), apparently proceeding through addition of oxygen to the side chain π-bond
Photochemical reorganisation of 1,7,7-trimethyl-3-(E-2′-arylethenyl)-2-oxabicyclo[4.4.0]deca-3,5-dienes
作者:R. P. Gandhi、R. C. Aryan
DOI:10.1039/c39880001024
日期:——
A novel photochemical conversion of 1,7,7-trimethyl-3-(E-2′-arylethenyl)-2-oxabicyclo[4.4.0]deca-3,5-dienes (6a–c) into the corresponding endo-1,7,7-trimethyl-11-aryl-tricyclo[4.4.0.12,4]undec-5-en-3-ones (7a–c) in high yield (75–80%) is reported.
UV irradiation of arylidene-β-ionones in the presence of dioxygen: regioselective formation of stable endoperoxides
作者:Rajinder Singh、M.P.S. Ishar
DOI:10.1016/s0040-4039(03)00086-8
日期:2003.2
UV irradiation of (E,E)-arylidene-β-ionones 1 leads to photoisomerization resulting in (Z,E) arylidene-β-ionones 2, which undergo electrocyclization to 1,7,7-trimethyl-3-(E-2′-arylethenyl)-2-oxabicyclo[4.4.0]deca-3,5-dienes 3, and the latter in the excited state add regioselectively, involving only the electron-rich endocyclic diene, to molecular oxygen affording highly stable endoperoxides 6.
Baeyer-Villiger oxidation of 5-aryl-7,11,11-trimethyltricyclo[5.4.0.0(3,6)]-undec-1-en-4-ones 4a-h by H2O2 and formic acid in methanol yields mixtures of 3b, 7,7-trimethyl-3-phenyl-3,3a,3b,4,5,6,7,8a-octa-hydro-1H- indeno-[1,2-c] furan-1-ones 8a-h and 3b,7,7-trimethyl-3-phenyl-3,3a,3b,4,5,6,7,8a-octahydro-1H- indeno-[1,2-c]furan-2-ones 9a-h in high yields. The obtained butyrolactones 8a-h display cytotoxic activity against a number of human cancer cells. (C) 2008 Elsevier Ltd. All rights reserved.
Gandhi, R. P.; Kumar, Sudhir; Aryan, R. C., Synthetic Communications, 1989, vol. 19, # 9-10, p. 1759 - 1762
作者:Gandhi, R. P.、Kumar, Sudhir、Aryan, R. C.、Ishar, M. P. S.