Synthesis of (1‐(Aminomethyl)‐2,3‐dihydro‐1<i>H</i>‐inden‐3‐yl)methanol: Structural Confirmation of the Main Band Impurity Found in Varenicline<sup>®</sup> Starting Material
作者:Frank R. Busch、Paul E. Concannon、Robert E. Handfield、Jason D. McKinley、Megan E. McMahon、Robert A. Singer、Timothy J. Watson、Gregory J. Withbroe、Mariano Stivanello、Lucia Leoni、Chiara Bezze
DOI:10.1080/00397910701771231
日期:2008.1.1
with Pfizer Groton, reported an unidentified impurity, referred to as the “main band impurity”, in 2 at levels of 0.4 to 0.8%. The structure was postulated to be 1, the open‐ring product of the lithium aluminum hydride (LAH) reduction of 3 to 2. Although the cis isomer of 1 was previously reported in the literature,2 a much shorter racemic synthesis was developed using intermediates employed for the production
摘要 这里描述的是(1-(氨基甲基)-2,3-二氢-1H-茚-3-基)甲醇 1 的合成,这是在 2,1 的合成中发现的先前未鉴定的杂质,提供了结构的确认。Fabbrica Italiano Sintetici (FIS) 与辉瑞格罗顿合作,报告了一种未鉴定的杂质,称为“主带杂质”,在 2 中的含量为 0.4% 至 0.8%。假定结构为 1,即氢化铝锂 (LAH) 的开环产物从 3 还原为 2。尽管 1 的顺式异构体先前已在文献中报道2,但使用中间体开发了一种更短的外消旋合成用于生产 Varenicline®。为合成 1 筛选了几种还原剂,使用 LiAlH4,然后在基本处理条件下获得最佳结果。