Indazoles represent a privileged scaffold in medicinal chemistry. In the presence of strong base, however, N-protected indazoles are prone to an undesirable ring-opening reaction to liberate o-aminobenzonitriles. By employing unprotected indazoles with a free N–H bond, isomerization is averted because the heterocycle is deprotonated in situ. We herein report functional group-tolerant and robust C–S
吲唑是药物
化学中的一种特殊支架。然而,在强碱的存在下,N-保护的
吲唑易于发生不希望的开环反应以释放邻
氨基
苯甲腈。通过使用带有NH键的未保护的
吲唑,由于杂环被原位去质子化,因此可以避免异构化。我们在本文中报道了在双(三甲基甲
硅烷基)酰胺
锂存在下,
溴吲唑与具有不同电子性质的
硫醇的官能团耐受性和稳健的C–S偶联。