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An efficient synthesis of 6H,7H-chromeno[4,3-b]chromenes and 6,7-dihydrothio chromeno[3,2-c]chromenes as 9-substituted xanthene like analogs

✍ Scribed by Sudipta Kumar Manna; Maloy Kumar Parai; Gautam Panda


Book ID
113929932
Publisher
Elsevier Science
Year
2011
Tongue
French
Weight
789 KB
Volume
52
Category
Article
ISSN
0040-4039

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Regioselective synthesis of [6c,12b-cis]
✍ Krishna C. Majumdar; Pranab Chatterjee; Subrata Saha πŸ“‚ Article πŸ“… 1998 πŸ› Elsevier Science 🌐 French βš– 116 KB

Asyloxymethylpyrano[2, [l]henzopyran-5(3H)-ones (la-f) on heating in N,N-diethylaniline snffereda [3s,3s] sigmatropic rearrangement followedby enolisation andan internal [1,61 Michael addition of the phenolic moiety to the diene-lactone moiety to give [6c,7,12b,4=B4 : 4,5]pyrano[2,3-c]chromen-l-one