KANG, HY CHO, YS KOH, HY CHANG, MH 2024-01-21T20:35:22Z 2024-01-21T20:35:22Z 2022-01-11 1995-09 0936-5214 https://pubs.kist.re.kr/handle/201004/144993 Synthesis of cephalosporin derivatives with cyclic substituents at the 3-position was efficiently achieved by the intramolecular 1,3-dipolar cycloaddition reactions. It has been confirmed that 3-alkylidenecepham-4-carboxylic acids derivatives could be utilized as efficient intermediates for preparation of the desired cephalosporin derivatives. Efficiency of the synthetic route was shown using a nitrone and a nitrile oxide derivatives as dipole components. English GEORG THIEME VERLAG ORGANIC-SYNTHESIS SAMARIUM(II) IODIDE LANTHANIDES REDUCTION HALIDES AN EXPEDIENT ENTRY TO CEPHALOSPORIN DERIVATIVES WITH CYCLIC SUBSTITUENTS AT THE 3-POSITION BY [3+2] CYCLOADDITION REACTIONS Article 1 SYNLETT, no.9, pp.907 - + SYNLETT 9 907 + scie scopus A1995TA41700009 2-s2.0-0011763002 Chemistry, Organic Chemistry Note ORGANIC-SYNTHESIS SAMARIUM(II) IODIDE LANTHANIDES REDUCTION HALIDES SYNTHESIS BETA-LACTAM CEPHALOSPORIN DERIVATIVES CYCLIC SUBSTITUTENTS CYCLOADDITION