A 4-step modified route has been developed for the synthesis of N-(2-ethyl-3-chloro-4-pyridinyl-2-[ 14 C])-4-(4-chlorophenoxy)phenylacetamide ([ 14 C]-1). The key transformation in the sequence is an amination/cyclization pair of reactions that furnished 2-[ 14 C]-4-amino-2-ethylpyridine (4) from 5-[ 14 C]-1-methoxyhept-1-en-3-yn-5-one (3) and ammonia. Amine 4 was then selectively chlorinated to provide
已开发了一种 4 步改进路线,用于合成 N-(2-乙基-3-
氯-4-
吡啶基-2-[ 14 C])-4-(
4-氯苯氧基)苯基乙酰胺 ([ 14 C]- 1)。序列中的关键转化是胺化/环化反应对,从 5-[ 14 C]-1-甲氧基庚-1-en-3 提供 2-[ 14 C]-4-
氨基-2-
乙基吡啶 (4) -yn-5-一 (3) 和
氨。然后将胺 4 选择性
氯化以提供 2-[ 14 C]-4-
氨基-3-
氯-2-
乙基吡啶 (5),然后在反应中将其与 4-(
4-氯苯氧基)
苯乙酸乙基
甲酸酐 (6) 偶联由
三甲基铝介导以提供所需的放射性标记的苯基乙酰胺[ 14 C]-1。