Improved and Scalable Synthetic Route to the Synthon 17-<font>β</font>-(2-Carboxyethyl)-1,3,5(10)-estratriene: An Important Intermediate in the Synthesis of Bone-Targeting Estrogens
作者:Shama Nasim、Ashish P. Vartak、William M. Pierce、K. Grant Taylor、Peter A. Crooks
DOI:10.1080/00397910903013796
日期:2010.2.12
17-β-(2-carboxyethyl)-1,3,5(10)-estratriene, is described. Previous approaches have failed to provide useful quantities of the analytically pure product because of facile retro-Michael breakdown of the β-alkoxy carbonyl precursors during workup and isolation operations. The synthetic approach described herein has been designed specifically to sidestep this problematic breakdown process. This new scalable method
描述了一种用于重要合成子 17-β-(2-羧乙基)-1,3,5(10)-雌三烯的多克级制备的改进的、高度可扩展的方法。由于 β-烷氧基羰基前体在后处理和分离操作期间容易逆迈克尔分解,以前的方法未能提供有用数量的分析纯产品。本文所述的合成方法专门设计用于避免这种有问题的分解过程。这种新的可扩展制备方法克服了探索以具有骨靶向特性的新型雌二醇衍生物为中心的构效关系的主要障碍,并为后续的开发工作提供了可扩展的过程。