We synthesized a series of novel small Molecules, 2,3-dihydro-3-hydroxymethyl-1,4-benzoxazine derivatives, by tandem reduction-oxirane opening of 2-nitroaroxymethyloxiranes in moderate or excellent yields. We investigated the effects of all of the Compounds on HUVEC apoptosis and A549 cell growth. The results showed that 6,8-dichloro-2,3-dihydro-3-hydroxymethyl-1,4-benzoxazine was the most effective small molecule in promoting HUVEC apoptosis and inhibiting A549 cell proliferation, but 6-amino-2,3-dihydro-3-hydroxymethyl-1,4-benzoxazine could remarkably inhibit HUVEC apoptosis and might induce the formation of microvessel. (c) 2006 Elsevier Ltd. All rights reserved.
Preparation and reactions of stable 2-lithio-6-nitrophenol derivatives
作者:Ian R. Hardcastle、Peter Quayle、E.Lucy M. Ward
DOI:10.1016/0040-4039(94)88335-1
日期:1994.3
2-Bromo-6-nitrophenyl MOM and SEM ethers from stable lithio compounds on treatment with phenyllithium. Reaction of the lithio species with a variety of electrophiles allows the preparation of 2-substituted-6-nitrophenols. The intramolecular trapping of (2′,3′-epoxypropyloxy)-2-lithio-4-methyl-6-nitrobenzene gives the substituted benzofuran (5).
The synthesis of 2H-1,4-benzoxazine derivatives from 1,2-epoxy-3-(2-nitroaryloxy)propanes in the presence of Hantzsch 1,4-dihydropyridine (HEH) and Pd/C as a catalyst was achieved. The nitro group was reduced before the epoxide functionality, leading to attack of the amino group on the epoxide moiety in a 6-exo-fashion. By introducing a methyl group at the 1-position, the 7-endo ring-closed product could also be formed.