A Versatile Enantioselective Catalytic Cyclopropanation‐Rearrangement Approach to the Divergent Construction of Chiral Spiroaminals and Fused Bicyclic Acetals
A highly enantioselective synthesis of various chiral heterobicyclic molecules including spiroaminals and fused bicyclic acetals has been developed via a chiral copper catalyzed cyclopropanation‐rearrangement (CP‐RA) approach under mild reaction conditions. Remarkably, the asymmetric CP‐RA for exocyclic vinyl substrates without a pro‐stereogenic carbon at the β‐position has been realized for the first
Enantioselective C2‐Alkylation of Indoles through a Redox‐Relay Heck Reaction of 2‐Indole Triflates
作者:Nicholas J. Race、Qianjia Yuan、Matthew S. Sigman
DOI:10.1002/chem.201805416
日期:——
enantioselective redox‐relay Heck reaction of 2‐indole triflates and disubstituted alkenes is reported. This process combines readily available indole triflates with a variety of alkenes to afford a range of indole derivatives bearing a stereocenter adjacent to C2. Enantioselectivity is achieved through use of a simple pyridine‐oxazoline ligand. Tuning the electronics of the indole, through judicious choice of N‐protecting
Catalytic Transformations of 2-Pyridones by Rhodium-Mediated Carbene Transfer
作者:Jiahui Su、Qiongya Li、Ying Shao、Jiangtao Sun
DOI:10.1021/acs.orglett.2c00151
日期:2022.3.4
compounds has been realized by using a chiral rhodiumcomplex as the catalyst, and the corresponding chiral cyclopropanes could be formed in good yields with high enantioselectivities. Moreover, using acceptor–acceptor dimethyl 2-diazomalonate as the carbene precursor, a novel 1,4-rearrangement of a Boc group from N to C has also been discovered under rhodium catalysis.
以手性铑配合物为催化剂,实现了N-取代的2-吡啶酮与重氮化合物的对映选择性环丙烷化反应,能够以良好的收率和高对映选择性生成相应的手性环丙烷。此外,使用受体-受体 2-重氮丙二酸二甲酯作为卡宾前体,还发现了在铑催化下 Boc 基团从 N 到 C 的新型 1,4-重排。