定义Definition
施蒂勒偶联是钯催化下有机锡化合物(R–SnBu₃)与有机卤化物或三氟甲磺酸酯形成 C–C 键的交叉偶联反应。
The Stille coupling is the palladium-catalysed cross-coupling of an organostannane (R–SnBu₃) with an organic halide or triflate to form a C–C bond.
机理与特点Mechanism and features
经氧化加成、转金属化(锡到钯)、还原消除的标准循环。有机锡试剂对空气、水稳定,几乎不与羰基等官能团反应,且无需加碱,因此在复杂天然产物合成中很有价值。LiCl、CuI 添加剂可加速转金属化。
It follows oxidative addition, Sn-to-Pd transmetalation and reductive elimination. Stannanes are air- and water-stable, inert toward carbonyls and need no base, making the reaction valuable in complex natural-product synthesis. LiCl or CuI additives speed transmetalation.
由来Origin
小杉正纪、右田俊彦等于 1977 年首先报道有机锡的钯催化偶联;美国化学家约翰·施蒂勒自 1978 年起系统发展,使之成为通用方法。
Kosugi, Migita and co-workers first reported Pd-catalysed coupling of stannanes in 1977; the American chemist John Stille developed it systematically from 1978 into a general method.
缺点Drawbacks
有机锡化合物毒性大,锡残留难以从产物中除尽,限制了它在药物生产中的应用,许多场合已被铃木偶联取代。
Organotin compounds are toxic and tin residues are hard to remove, limiting pharmaceutical use; the Suzuki coupling has replaced it in many cases.
反应Reactions
Pd(PPh₃)₄ 或 Pd₂(dba)₃/AsPh₃,甲苯或 DMF,60–110 °C
Pd(PPh₃)₄ or Pd₂(dba)₃/AsPh₃ in toluene or DMF at 60–110 °C
氧化加成。
Oxidative addition.
有机基团从锡转移到钯。
Transfer of the organic group from tin to palladium.
还原消除生成产物。
Reductive elimination gives the product.
乙烯基化。
A vinylation.
年表Timeline
- 1977
小杉、右田报道有机锡偶联
Kosugi and Migita report stannane coupling
- 1978
施蒂勒开始系统研究
Stille begins systematic studies