Optically active alpha-sulfanylphosphonates and the corresponding methyl sulfides were prepared in three steps starting from chiral, nonracemic (ee 93-97%) alpha-hydroxyphosphonates obtained by enzymatic resolution. Reaction conditions for the reduction of racemisation-prone substrates were found to preserve the enantiomeric excesses. (C) 2003 Elsevier Science Ltd. All rights reserved.
CALICHEAMICIN DERATIVES AND ANTIBODY DRUG CONJUGATES THEREOF
申请人:PFIZER INC.
公开号:US20190345186A1
公开(公告)日:2019-11-14
The present invention is directed to novel calicheamicin derivatives useful as payloads in antibody-drug-conjugates (ADC's), and to payload-linker compounds and ADC compounds comprising the same; to pharmaceutical compositions comprising the same and to methods for using the same to treat pathological conditions such as cancer.