Catalytic S<sub>N</sub>
2′- and Enantioselective Allylic Substitution with a Diborylmethane Reagent and Application in Synthesis
作者:Ying Shi、Amir H. Hoveyda
DOI:10.1002/anie.201600309
日期:2016.3.1
A catalytic method for the site‐ and enantioselective addition of commercially available di‐B(pin)‐methane to allylic phosphates is introduced (pin=pinacolato). Transformations may be facilitated by an NHC–Cu complex (NHC=N‐heterocyclic carbene) and products obtained in 63–95 % yield, 88:12 to >98:2 SN2′/SN2 selectivity, and 85:15–99:1 enantiomeric ratio. The utility of the approach, entailing the
介绍了一种将市售的二-B(pin)-甲烷位点和对映选择性加成到烯丙基磷酸酯上的催化方法(pin=pinacolato)。 NHC-Cu 络合物(NHC=N-杂环卡宾)可促进转化,产物收率 63-95%,选择性为 88:12 至 >98:2 S N 2′/S N 2,选择性为 85:15 –99:1 对映体比例。该方法的实用性涉及不同的催化交叉偶联过程,其在细胞毒性天然产物 rhopaloic Acid A 的正式合成中的应用凸显了该方法的实用性。