3-Arylsulfonyl pyrroles can be readily obtained from 3-Br-TIPS pyrrole via halogen-metal exchange and subsequent sulfonylation. The regioselectivity of the subsequent directed ortho-metallation (DOM) reaction in order to functionalise the C-2 position depends on the nature of the base (LTMP, n- or s-BuLi) and the N-substituent (SEM or Boc) used. The bulk of the N-substituent also strongly influences
3-芳基磺酰基
吡咯可以很容易地从 3-Br-
TIPS 吡咯通过卤素-
金属交换和随后的磺酰化获得。为了使 C-2 位置功能化,随后的定向邻位
金属化 (
DOM) 反应的区域选择性取决于所用碱(L
TMP、n-或 s-BuLi)和 N-取代基(
SEM 或 Boc)的性质. 大部分 N-取代基也强烈影响随后 Suzuki 与 2-iodo-3-arylsulfonyl pyrrole 衍
生物偶联的产率。