Total Synthesis of the Naturally Occurring Endothelin Converting Enzyme (ECE) Inhibitor WS 75624 A
作者:Thorsten Bach、Stefan Heuser
DOI:10.1055/s-2002-35568
日期:——
The ECE inhibitor WS 75624 A (1a) was synthesized following a convergent strategy. 2,4-Dibromothiazole (2) served as the central building block, which underwent consecutive cross-coupling reactions. In the first C-C bond formation step, it was substituted at carbon atom C-2 by a C7-alkylzinc chloride derived from iodide 8 (85% yield). In the second step, the intermediate 4-bromothiazole 9 was converted to the corresponding stannane 10 which was coupled at carbon atom C-4 to the 2-iodopyridine 6 (75% yield).
ECE 抑制剂 WS 75624 A(1a)是通过聚合策略合成的。2,4-二溴噻唑(2)作为中心结构单元,经历了连续的交叉耦合反应。在第一个 C-C 键形成步骤中,它的碳原子 C-2 被来自碘化物 8 的 C7-烷基氯化锌取代(产率 85%)。在第二步中,中间体 4-溴噻唑 9 转化为相应的锡烷 10,锡烷 10 在碳原子 C-4 处与 2-碘吡啶 6 发生偶联反应(收率为 75%)。