Rangaswami; Seshadri, Proceedings - Indian Academy of Sciences, Section A, 1937, # 6, p. 112,115
作者:Rangaswami、Seshadri
DOI:——
日期:——
Über Cumarino-α-pyrone
作者:E. Späth、P. H. Löwy
DOI:10.1007/bf01798104
日期:1937.12
Ring-closing-metathesis-based synthesis of annellated coumarins from 8-allylcoumarins
作者:Christiane Schultze、Bernd Schmidt
DOI:10.3762/bjoc.14.278
日期:——
conveniently accessible through a microwave-promoted tandem Claisen rearrangement/Wittig olefination/cyclizationsequence. They serve as a versatile platform for the annellation of five- to seven-membered rings using ring-closing olefin metathesis (RCM). Furano-, pyrano-, oxepino- and azepinocoumarins were synthesized from the same set of precursors using Ru-catalyzed double bond isomerizations and RCM in a defined
Site-selectivity in [2+2]-Photocycloadditions of 2H,8H-Benzo[1,2-b:3,4-b′]dipyran-2,8-dione to Alkenes†‡
作者:John Bethke、Paul Margaretha、Anna M. Wynne、Richard A. Caldwell
DOI:10.1039/a707819f
日期:——
On irradiation (λ=350ânm) in the presence of 2,3-dimethylbut-2-ene or 2-methylpropene the title compound 2 undergoes cycloaddition at the C(9)âC(10) double bond selectively (>15:1) to afford the 8a,9,10,10a-tetrahydro-2H,8H-cyclobuta[c]pyrano[2,3-f][1]benzopyran-2,8-diones 3.