A highly regioselective hydrocarbonylation of phenylacetylene with thiols and alcohols was developed using metal carbonyls/diazabicyclo[2.2.2]octane (DABCO) system at 100 °C in DMF. The use of Mo(CO)6 and thiols in the presence of DABCO was applied as an efficient Pd-free method for hydrothiocarbonylation of phenylacetylene into trans-α,β-cinamyl thioesters in excellent yields (88–98%). Similar reaction
which is performed under atmospheric pressure of CO in the absence of acids, has been developed. Palladium hydride (Pd-H) generated from triethylsilane (Et3SiH) rather than the traditionally used strong acid (HX) is applied for the first time in this transformation. In addition, an unusual counteranion-controlled linear and branch selectivity for terminal alkynes is observed under otherwise identical
已经开发出一种用于炔烃烃基化的超温和反应条件,该反应条件是在 CO 大气压下在不存在酸的情况下进行的。由三乙基硅烷 (Et 3 SiH) 而不是传统上使用的强酸 (HX)生成的氢化钯 (Pd-H)首次应用于该转化中。此外,在其他相同条件下观察到不寻常的抗衡阴离子控制的末端炔烃的线性和支化选择性。广泛的 1,1-、1,2- 和 1,2,2-取代的 α,β-不饱和硫酯或酰胺可以区域选择性地从末端和内部炔烃中以中等到极好的收率获得。此外,当使用 2-(叔-丁基)- N -(2-炔基苯基)苯胺作为底物,在 TMS-SYNPHOS 作为手性配体存在下。
Ligand‐Controlled Regiodivergent Thiocarbonylation of Alkynes toward Linear and Branched α,β‐Unsaturated Thioesters
作者:Han‐Jun Ai、Wangyang Lu、Xiao‐Feng Wu
DOI:10.1002/anie.202106079
日期:2021.7.26
the synthesis of unsaturated thioesters. A robust ligand-controlled regioselective thiocarbonylation of alkynes is developed. Utilizing boronic acid and 5-chlorosalicylic acid as the acid additive to in situ form 5-chloroborosalicylic acid (5-Cl-BSA), and bis(2-diphenylphosphinophenyl)ether (DPEphos) as the ligand, linear α,β-unsaturated thioesters were produced in a straightforward manner. Switching