Kang, HY Lee, SH Choi, KI Koh, HY 2024-01-21T19:11:34Z 2024-01-21T19:11:34Z 2021-09-05 1996-10-14 0040-4039 https://pubs.kist.re.kr/handle/201004/144268 An efficient synthetic route for cephalosporin derivatives with various substituents at the 3-position has been developed It involves cycloaddition with silyl enol ethers or silylketene acetals followed by fragmentation utilizing the 3-cephem triflate 1 as a starting material. Copyright (C) 1996 Elsevier Science Ltd English PERGAMON-ELSEVIER SCIENCE LTD Synthesis of cephalosporin derivatives utilizing the cephem triflate .1. introduction of 3-position substituents via a cycloaddition-fragmentation route Article 10.1016/0040-4039(96)01714-5 1 TETRAHEDRON LETTERS, v.37, no.42, pp.7549 - 7552 TETRAHEDRON LETTERS 37 42 7549 7552 scie scopus A1996VL99300022 2-s2.0-0030583480 Chemistry, Organic Chemistry Article cycloaddition