描述了用于新型吡啶酮缀合的单bactam抗生素的单环β-内酰胺核17的工艺开发和多千克合成。从市售的2-(2,2-二乙氧基乙基)异吲哚啉-1,3-二酮开始,五步合成具有几种伸缩操作和直接分离功能,与最初的大规模生产活动相比,可显着提高生产量并减少溶剂用量。这项工作的一个特别亮点包括开发了一种有效的Staudinger烯酮-亚胺[2 + 2] N -Boc-甘氨酸烯酮12和亚胺9的环加成反应,形成外消旋β-内酰胺13分离产率(66%)和纯度(97%)良好。合成中的另一个关键特征涉及外消旋胺15的经典拆分,以优异的分离收率(45%)和高的对映体过量(98%)提供了单一对映体盐17。
Enabled Process To Synthesize Monobactam <b>1</b> for Early Development
作者:Yong Tao、Manjinder S. Lall、David C. Boyles、Susan C. Lilley、Sebastian D. Pattavina、Robert J. Rafka、Barbara J. Sitter、Andrew Morgan Stewart、Jan Szeliga、Gerald A. Weisenburger
DOI:10.1021/acs.oprd.9b00374
日期:2019.11.15
bond, a high yielding reaction to introduce N-sulfonic moiety, and a global deprotection to remove all protecting groups. Practical procedures were developed to isolate intermediates en route by adding a concentrated substrate to antisolvents to obtain filterable amorphous solids with partial purification. Amberchrom CG161M resin was applied not only as a “resin-capture–release” tool to remove the bulk