作者:Ya-Fei Ji、Jian-An Jiang、Hong-Wei Liu、Dao-Hua Liao、Xian-Yong Wei
DOI:10.1080/00397911.2011.644380
日期:2013.6.3
the classical antibacterial agent trimethoprim (1) was achieved in 85% overall yield from 3,4,5-trimethoxybenzaldehyde (2). First, the addition of propenenitrile (3) with dimethylamine almost quantitatively afforded 3-dimethylaminopropanenitrile (7). Then, by condensation of 7 with 2 as well as the continuous replacement of 3-dimethylamino group with aniline in situ, the key intermediate 3-anilino-2-(3
摘要 以 3,4,5-三甲氧基苯甲醛 (2) 为原料,以 85% 的总收率实现了一种高效、简单且温和的经典抗菌剂甲氧苄啶 (1) 的制备。首先,丙烯腈 (3) 与二甲胺的加入几乎定量地提供了 3-二甲氨基丙腈 (7)。然后,通过 7 与 2 的缩合以及 3-二甲氨基用苯胺原位连续置换,得到关键中间体 3-苯胺基-2-(3,4,5-三甲氧基苄基)丙烯腈 (9)一锅法的收率高达 91%。最后,在过量甲醇钠存在下,9 与硝酸胍的环化以高达 95% 的产率提供了 1。补充材料可用于本文。去出版商' 的 Synthetic Communications® 在线版以查看免费的补充文件。图形概要