Direct Carbohydroxylation of Arylalkenes with Allylic Alcohols: Cooperative Catalysis of Copper, Silver, and a Brønsted Acid
作者:Waqar Ahmed、Sheng Zhang、Xiaoqiang Yu、Xiujuan Feng、Yoshinori Yamamoto、Ming Bao
DOI:10.1002/anie.201813148
日期:2019.2.18
The cooperative catalysis of copper, silver, and Brønsted acid is presented as a new strategy for olefin functionalization. The catalytic direct carbohydroxylation of arylalkenes with allylic alcohols provided a straightforward and efficient approach for preparing 4,5‐unsaturated alcohols. Synthetically useful functional groups, such as Cl, Br, carbonyl, and chloromethyl, remained intact during the
A ligand‐controlled regiodivergent and enantioselectivecopper‐catalyzed intermolecular hydroallylation of alkynes with allylic phosphates and hydrosilanes has been achieved for the first time. The chiral bidentate sulfonate‐containing N‐heterocyclic carbene ligated CuCl complex leads to enantioenriched SN2′‐type products, whereas the use of the IMesCuCl catalyst affords SN2‐type products. Thus a range
炔烃与烯丙基磷酸酯和氢硅烷的配体控制的区域发散性和对映选择性铜催化的分子间氢化反应已经实现。含手性双齿磺酸盐的N杂环卡宾连接的CuCl配合物可生成对映体富集的S N 2'型产物,而IMesCuCl催化剂的使用可提供S N 2型产物。因此,可以容易地从易得的炔烃以区域发散的方式容易地合成一系列手性支化和非手性线性1,4-二烯。
Asymmetric 1,2‐Migration at Vicinal Tetrasubstituted Stereocenters Constructed from α‐Keto Imines
作者:Ganesh Karan、Samrat Sahu、Abhisek Metya、Modhu Sudan Maji
DOI:10.1002/anie.202405212
日期:2024.7.22
α-hydroxy imines possessing synthetically challenging vicinaltetrasubstituted stereocenters. The electrophilicity of the imine and steric effects promoted a face-selective 1,2-allyl migration in the presence of Lewis acidic boronic acids, yielding chiral α-amino ketones with excellent diastereoselectivity. This method was applied to the total synthesis of hapalindole alkaloids.