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829results about "Sulfonic acid esters preparation" patented technology

Stereoselective Synthesis of Amino Acid Analogs for Tumor Imaging

InactiveUS20060292073A1Maximum service lifeOrganic compound preparationSulfonic acid esters preparation1-amino-3-fluorocyclobutane-1-carboxylic acidCyclobutane
The radiolabeled non-natural amino acid 1-amino-3-cyclobutane-1-carboxylic acid (ACBC) and its analogs are candidate tumor imaging agents useful for positron emission tomography and single photon emission computed tomography due to their selective affinity for tumor cells. The present invention provides methods for stereo-selective synthesis of syn-ACBC analogs. The disclosed synthetic strategy is reliable and efficient and can be used to synthesize a gram quantity of various syn-isomers of the ACBC analogs, particularly, syn-[18F]-1-amino-3-fluorocyclobutane-1-carboxylic acid (FACBC) and syn-[123I]-1-amino-3-iodocyclobutane-1-carboxylic (IACBC) acid analogs.
Owner:EMORY UNIVERSITY

Gemini perfluoroalkylsulfonyloxybenzyl cationic surfactant as well as preparation and application thereof

The invention discloses a gemini perfluoroalkylsulfonyloxybenzyl cationic surfactant as well as preparation and application thereof. The structural general formula of the surfactant is as shown in a formula I, wherein Rf is perfluorobutylsulfonyl or perfluorohexylsulfonyl; n is 2, 3, 4 or 6; X is a counter anion. The perfluorobutylsulfonyl or the perfluorohexylsulfonyl is a fluorine-containing precursor material; the gemini perfluoroalkylsulfonyloxybenzyl cationic surfactant is obtained through the sulfonation of the fluorine-containing precursor material with p-hydroxybenzylalcohol, chlorination with a halogenating reagent and quaternization with tetramethyl alkyl diamine. The gemini cationic surfactant provided by the invention is free of a perfluorooctyl group with a lasting organic pollutant characteristic, high in surface activity and low in critical micelle concentration; an aqueous film-forming foam fire extinguishing agent obtained by compounding the gemini cationic surfactant with additives is quick in aqueous film-forming spreading speed and excellent in fire extinguishing performance.
Owner:HUAZHONG NORMAL UNIV +1

Compound for preparation of cariprazine and preparation method thereof

The invention relates to a compound for preparation of cariprazine and a preparation method thereof. The method can overcome the defects in the prior art, the used raw materials and reagents are low toxic, cheap and easily available, the reaction conditions are mild, fewer three wastes are generated, at the same time, the operation is simple and safe, and the yield is good, therefore the method is suitable for industrialized production.
Owner:NHWA PHARMA CORPORATION
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