Novel photochemical transformation of 4-methyl-2′-hydroxyisoflavenes to benzofuro [3,2-b]benzofurans
作者:S. Ramakanth、Usha Rao、K. Narayanan、K. K. Balasubramanian
DOI:10.1039/c39830000842
日期:——
The photolysis of 4-methyl-3-(2-hydroxyphenyl)chrom-3-enes(1) in methanol at 300 nm affords 4b,9b-dihydro-4b, 9b-dimethylbenzofuro[3, 2-b]benzofurans (2), in good yield and the reaction rate is accelerated by sodium methoxide.
4-甲基-3-(2-羟苯基)chrom-3-enes(1)在甲醇中于300 nm处光解得到4b,9b-dihydro-4b,9b-二甲基苯并呋喃[3,2- b ]苯并呋喃(2) ,收率好,甲醇钠可加快反应速度。
Kozlikovskii, Ya, B.; Chernyaev, B. V.; Myshko, Yu. V., Journal of Organic Chemistry USSR (English Translation), 1988, p. 1355 - 1357
作者:Kozlikovskii, Ya, B.、Chernyaev, B. V.、Myshko, Yu. V.
DOI:——
日期:——
RAMAKANTH, S.;RAO, USHA;NARAYANAN, K.;BALASUBRAMANIAN, K. K., J. CHEM. SOC. CHEM. COMMUN., 1983, N 15, 842-843
作者:RAMAKANTH, S.、RAO, USHA、NARAYANAN, K.、BALASUBRAMANIAN, K. K.
DOI:——
日期:——
KOZLIKOVSKIJ, YA. B.;CHERNYAEV, B. V.;MYSHKO, YU. V., ZH. ORGAN. XIMII, 24,(1988) N 7, 1504-1508
作者:KOZLIKOVSKIJ, YA. B.、CHERNYAEV, B. V.、MYSHKO, YU. V.
DOI:——
日期:——
A novel photochemical ring contraction of 11a-methylpterocarpans
A novelphotochemical ring contraction of 6H-(benzofuro)(3,2-c)(1)11a,6a-dihydro-11a-methylbenzopyrans, 1 or shortly, 11a-methylpterocarpans to the respective 4b,9b-dihydro-4b,9b-dimethylbenzofuro(3,2-b)benzofurans 2 is reported. This transformation of 1 → 2 is envisaged to proceed through a mechanism involving the intermediacy of 6. An unusual acceleration of this photochemical rearrangement by bases