This invention relates to a novel chartreusin derivative of the general formula (I): ##STR1## and a salt thereof. This chartreusin derivative and a salt thereof have an excellent antitumor activity, which is exhibited even when the site of cancer inoculation and the site of drug administration are different. This invention further relates to a antitumorous composition containing the above-mentioned compound as active ingredient. This invention furthermore relates to a process for producing the above-mentioned chartreusin derivative or salt thereof.
Modification of the swern oxidation: use of a recyclable, polystyrene bound sulfoxide
作者:Derek C Cole、Joseph R Stock、Jo Anne Kappel
DOI:10.1016/s0960-894x(02)00281-0
日期:2002.7
A method has been developed for the oxidation of sulfides to sulfoxides on polystyrene resin. The polystyrene bound sulfoxide may be used in Swernoxidation reactions, and the used reagent may be regenerated by oxidation with tert-butylhydrogen peroxide.
Dirchromone is a bioactive vinyl sulfoxide-bearing chromone first isolated from the shrub Dirca palustris. Altogether, 32 of its derivatives were prepared to assess the effect of substitution of its chromone core upon activities against cancer cell lines, Gram-positive bacteria, and fungi (such as Candida albicans). All compounds were synthesized following a synthetic strategy involving Pummerer and
light on the pivotal role of its peculiar vinylsulfoxide sidechain towards its cytotoxic and antimicrobial properties, especially dependant upon the presence and oxidation state of sulfur. The reaction of dirchromone with cysteamine revealed a surprising Michael acceptor behavior with elimination of the methylsulfinyl moiety and redox transformation of the sulfur atom that could be involved in the mode
Aerobicphotooxidation in the aqueous phase is a promising field, but it faces the challenge of water-induced photocatalyst deactivation. In this work, we prepared three TADF-based photocatalysts with enhanced hydrophobicity to protect the excited state against water. Efficient aerobicphotooxidation of sulfides into sulfoxides was realized in water owing to their extended triplet state lifetimes.