A process for the total synthesis of thiocoraline and BE-22179 establishes the relative and absolute stereochemistry of these compounds and enables the construction and characterization of a series of related analogues. The mechanism for the bioactivity of thiocoraline, BE-22179 and their related analogues is charaterized. Thiocoraline, BE-22179, and their related analogues are disclosed to bind to DNA by high-affinity bisintercalation and are disclosed to exhibit exceptional cytotoxic activity.
Sulphur analogs of cephalosporins having a nucleophile substituted in
申请人:Massachusetts Institute of Technology
公开号:US04381300A1
公开(公告)日:1983-04-26
Biologically active sulfur analogs of 6-aminopenicillanic acid having a nucleophile substituted in the 6- position are made by reacting a sulfenyl chloride with esters of diazopenicillanic acid. Biologically active sulfur analogs of 7-aminocephalosporanic acid having a nucleophile substituted in the 7- position are analogously made by reacting a sulfenyl chloride with esters of 7-diazocephalosporanic acid. Deacetoxycephalosporins can be formed from the corresponding analog of 6-aminopenicillanic acid and derivations thereof, by sulfoxide rearrangement of the thiazolidine ring of penicillins to the dihydrothiazine ring of cephalosporins. These nucleophile substituted sulfur analogs of penicillins and cephalosporins are new antibacterial agents and display antibacterial activity against a variety of microorganisms.
Anti-reflective coatings formed from new polymers and having high etch rates are provided. Broadly, the coatings are formed from a polymer binder and a light attenuating compound. The polymer binder has halogen atoms bonded thereto, preferably to functional groups on the polymer binder rather than to the polymer backbone. Preferred polymer binders comprise acrylic polymers while it is preferred that the halogenated functional groups of the polymer binders be dihalogenated, and more preferably trihalogenated, with chlorine, fluorine, or bromine atoms.
The compound 9-B-D-arabinofuranosyl-2-amino-6-methoxy-9H-purine along with its 5'-acetyl and 5'-(4-methoxy-4-oxobutyryl derivatives are disclosed as inhibitors of Varicella Zoster virus (VZV).
Sulphur analogs of penicillins having a nucleophile substituted in the 6
申请人:Massachusetts Institute of Technology
公开号:US04265882A1
公开(公告)日:1981-05-05
Biologically active sulfur analogs of 6-aminopenicillanic acid having a nucleophile substituted in the 6-position are made by reacting a sulfenyl chloride with esters of diazopenicillanic acid. Biologically active sulfur analogs of 7-aminocephalosporanic acid having a nucleophile substituted in the 7-position are analogously made by reacting a sulfenyl chloride with esters of 7-diazocephalosporanic acid. Deacetoxycephalosporins can be formed from the corresponding analog of 6-aminopenicillanic acid and derivations thereof, by sulfoxide rearrangement of the thiazolidine ring of penicillins to the dihydrothiazine ring of cephalosporins. These nucleophile substituted sulfur analogs of penicillins and cephalosporins are new antibacterial agents and display antibacterial activity against a variety of microorganisms.