Synthesis and Cytotoxicity of 9‐Substituted Benzo[de]chromene‐7,8‐dione and 5‐Benzyl‐9‐substituted Benzo[de]chromene‐7,8‐dione
摘要:
New Mansonone analogues of 9-substitued benzo[ de] chromene-7,8-dione 5b-e and 5-benzyl-9-substitued benzo[ de] chromene-7,8-dione 6a-e were prepared through a modified route. The first step involved a bulky base t-butylamine mediated regioselective deacetylation of 2-substituted-1,4-naphth-diyl diacetate, resulting in obtaining of monoacetate 4-acetate 2 in high yield. The mechanism of cyclization, debenzylation, and oxidation for the formation of 5a - e and 6a - e were discussed. The cytotoxicity of the prepared compounds 5 and 6 were comparable with naturally occurring Mansonone F.
Synthesis and Cytotoxicity of 9‐Substituted Benzo[de]chromene‐7,8‐dione and 5‐Benzyl‐9‐substituted Benzo[de]chromene‐7,8‐dione
摘要:
New Mansonone analogues of 9-substitued benzo[ de] chromene-7,8-dione 5b-e and 5-benzyl-9-substitued benzo[ de] chromene-7,8-dione 6a-e were prepared through a modified route. The first step involved a bulky base t-butylamine mediated regioselective deacetylation of 2-substituted-1,4-naphth-diyl diacetate, resulting in obtaining of monoacetate 4-acetate 2 in high yield. The mechanism of cyclization, debenzylation, and oxidation for the formation of 5a - e and 6a - e were discussed. The cytotoxicity of the prepared compounds 5 and 6 were comparable with naturally occurring Mansonone F.
Syntheses of Naphthoquinone Compounds Using Chromium Carbonyl Carbene Complexes
作者:Masakazu Yamashita、Takahiro Ohishi
DOI:10.1246/bcsj.66.1187
日期:1993.4
The chromium carbonyl carbenecomplexes bearing an acetoxyl group and a phenyl substituent were found to react smoothly with acetylene compounds to produce naphthoquinone derivatives in good yields after oxidation. This cycloaddition reaction proceeded regioselectively and several naphthoquinones were prepared selectively from the complex and unsymmetrical acetylenes.