Abstract: Provided are methods for forming a reactive S-nitroso thioacid (NTA), comprising nitrosation of a thioacid with a nitrosation reagent. Also provided are methods for: acylating a nucleophile including selective acylation with a high degree of selectivity toward amines over hydroxyls; amide or peptide bond formation; forming a dipeptide or polypeptide; and peptide coupling/ligation, comprising use of thioacid and amine starting materials, wherein the reactions are mediated by very reactive S-nitroso thioacid (NTA) intermediates enabling extremely fast reactions under mild conditions, providing for broad applications.
Abstract: There is disclosed an advantageous mixed acid anhydride production method of formula (1):
wherein R1, R2 and Y denote the same as defined below, n and p denote an integer of 1 or 2, which is characterized by adding a carboxylic acid of formula (2);
wherein R1 denotes a hydrogen atom, an optionally substituted alkyl group or the like, an organic base to a solution of a carboxylic acid activating agent of formula (3);
wherein R2 denotes an optionally substituted aliphatic hydrocarbyl group or the like, Y denotes a carbon atom, a phosphorus atom, or a sulfur atom, and X denotes a chlorine atom or the like.
Abstract: Material and process of preparing such material, of the formula
where R1 is a linker and C(R2P(R3)2)3 group is a triphos moiety; and wherein R1 is selected from branched and linear alkyl group and alkyl carbonyl group optionally substituted with functional groups comprising carbonyl, alkoxy, hydroxy, amino, nitro, carboxylic or sulfonic acid and esters or amides thereof; R2 are methylene (CH2) or substituted methylene groups; R3 are linear or branched alkyl or phenyl or substituted phenyl groups; polymer is any polymer containing aromatic groups, comprising polystyrene, poly-vinyl pyridine, poly pyrrole, poly pyrrolidone or derivatives thereof. The material impregnated with a transition metal has catalytic properties. The preparation of the material involves the use of an acylating agent having the formula CF3SO3C(O)C(H2X)3 or an anhydride thereof, where X is a halogen.
Abstract: Products derived from the reaction of organic or metal salts of diorganodithiocarbamic acids with benzenesulfonyl halides, impart excellent multifunctional antiwear and antioxidant properties to lubricating oil compositions.
September 10, 1990
Date of Patent:
June 9, 1992
Mobil Oil Corp.
Angeline B. Cardis, Abraham O. M. Okorodudu
Abstract: 1-Phenyl-3-azabicyclo[3.1.1]-heptane-2,4-diones of the formula ##STR1## in which R.sub.1 represents hydrogen or a saturated or unsaturated, aliphatic, cycloaliphatic, cycloaliphatic-aliphatic, aromatic or aromatic-aliphatic hydrocarbon radical having up to and including 18, preferably up to and including 12, carbon atoms, R.sub.2 represents hydrogen, lower alkyl, sulpho or acyl, R.sub.3 represents hydrogen or lower alkyl and R.sub.4 represents hydrogen, lower alkyl, phenyl or phenyl substituted by --N(R.sub.2)(R.sub.3), and salts of these compounds, have valuable pharmacological properties, are effective as aromatase inhibitors and can therefore be used for the treatment of hormone-dependent diseases, especially mammary carcinoma.
April 22, 1988
Date of Patent:
August 15, 1989
Alex Alder, Jaroslav Stanek, Daniel Bellus