Naphth oxepins

Samaderin B, (17 ,2A,5R,5a7 ,7a3, 113, lla3, llhR,14.5 )T,7,7tf,ll,ll ,117-hexahydro-l,ll-dihydroxy-8,lltf,14-tri-methyl-277-5tf,2,5-(methanoxymetheno)naphth[l,2-<7]oxepine-4,6,10(577)-trione, and samaderin C, (lR,2S,5R,5aR, 7aS, KXS, 113, 11 3, 1 HR, 14S)-7,7a, 10, ll,ll ,117-hexahydro-l, 10,11 -trihydroxy-8, ll ,14-trimethyl-277-5 , 2,5-(metha-noxymetheno)naphth[l,2- oxepine-4,6(177,577)-dione, were isolated from the seed kernels of Samadera indica and exhibit antifeedant activity against Spodoptera litura third-instar larvae <2003AXC416>. 

Jones et reported a /(C,F) = 5.5 Hz in 9,10,11,12-tetrafluoro-5,6-dihydrobenzo[i>]naphth[2,l-f]oxepine, where the F- -H distance between the coupled F nucleus and the H nucleus bonded to the coupled carbon atom was calculated with the MM3 approach as 2.449 A. They ascribed the origin of such coupling to the n(F)— (C—H) charge transfer interaction. The important influence of electron delocalizations on coupling constants suggests that a charge transfer interaction between two proximate moieties favours a transmission. For instance, V(N,HMe) = 0.13 Hz was measured in 2-OMe-pyridine (14), and an n(N) — (CMe Ht) interaction of 0.95 kcalmoU was... 

Cumulative Index of Heterocyclic Systems Naphth[2,l- ]oxepin (1298)... 

Dihydro-6,8,9-trihydroxy-1 -oxo-1H-benzo[/]naphth[l,8-Z>c]oxepin-2-carboxylic acid, see S-10005... 

H-Naphtho[l,2-b]pyran-2-ones, 5,6-dihydro- 27, 989 Naphthoxazcdes 26, 395 2H-Naphth[l,8-bc]oxepin-2-ones 22,277 suppl. 26 Napieral s. Bischler Neighboring group participation (s. a. Andiimeric process)... 

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