Regioselective Heck Couplings of α,<i>β</i>-Unsaturated Tosylates and Mesylates with Electron-Rich Olefins
作者:Anders Lindhardt Hansen、Troels Skrydstrup
DOI:10.1021/ol052136d
日期:2005.12.1
[chemical reaction: see text]. Highly regioselective Heck couplings of alpha,beta-unsaturated tosylate and mesylate derivatives with N-acyl N-vinylamines and vinyl ethers were achieved. Several 2-alkoxy-1,3-dienes and 2-acylamino-1,3-butadienes were synthesized in good yields using 1.5 mol % of Pd2(dba)3, 3 mol % of DPPF, and diisopropylethylamine in dioxane. When working with alpha,beta-unsaturated
[化学反应:见正文]。实现了α,β-不饱和甲苯磺酸酯和甲磺酸酯衍生物与N-酰基N-乙烯基胺和乙烯基醚的高度区域选择性Heck偶联。使用1.5 mol%的Pd2(dba)3、3 mol%的DPPF和二异丙基乙胺的二恶烷溶液,可以高收率合成数种2-烷氧基-1,3-二烯和2-酰基氨基-1,3-丁二烯。当使用α,β-不饱和酮和酯时,该方法为使用三氟甲磺酸亲电子试剂的类似偶联提供了一种成本更低的替代方法。