Enzymes in Organic Chemistry, 11:[1] Hydrolase-Catalyzed Resolution ofα- andβ-Hydroxyphosphonates and Synthesis of Chiral, Non-Racemicβ-Aminophosphonic Acids
作者:A. Woschek、Wolfgang Lindner、F. Hammerschmidt
DOI:10.1002/adsc.200303135
日期:2003.12
enantioselective acylation of racemic diisopropyl α- and β-hydroxyphosphonates by hydrolases in t-butyl methyl ether with isopropenyl acetate as acyl donor is limited by the narrow substrate specificity of the enzymes. High enantiomeric excesses (up to 99%) were obtained for the acetates of (S)-diisopropyl 1-hydroxy-(2-thienyl)methyl-, 1-hydroxyethyl- and 1-hydroxyhexylphosphonate and (R)-diisopropyl 2-hydroxypropylphosphonate
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.
[EN] CALICHEAMICIN DERIVATIVES AND ANTIBODY DRUG CONJUGATES THEREOF<br/>[FR] DÉRIVÉS DE CALICHÉAMICINE ET CONJUGUÉS ANTICORPS-MÉDICAMENTS DE CEUX-CI
申请人:PFIZER
公开号:WO2018138591A1
公开(公告)日:2018-08-02
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.
Racemic α-acyloxyalkylphosphonates (±)-4 are prepared and tested for kinetic resolution by lipases AP 6 and to a minor extent by F-AP 15. The former proves to be a useful enzyme in terms of broadness of application, reaction rate and enantiomeric excess. Lipase F-AP 15 transformed neither of the two substrates checked for hydrolysis. Enzymatic hydrolysis of α-acyloxyphosphonates containing straight chain alkyl groups with lipase AP 6 yields (S)-α-hydroxyalkylphosphonates 3 preferentially. Substrates with branched chain alkyl groups are hydrolysed with lower enantioselectivity, the (R)-ester being saponified more easily than the (S)-ester.
制备了外消旋δ-±-乙酰氧基烷基膦酸盐 (±)-4,并通过脂肪酶 AP 6 和少量 F-AP 15 进行了动力学解析测试。前者在应用广泛性、反应速度和对映体过量方面被证明是一种有用的酶。脂肪酶 F-AP 15 对两种底物都没有进行水解转化。用脂肪酶 AP 6 对含有直链烷基的 δ-acyloxyphosphonates 进行酶水解,可优先生成 (S)-δ-hydroxyalkylphosphonates 3。含有支链烷基的底物水解的对映选择性较低,(R)-酯比(S)-酯更容易被皂化。