Site-Selective Functionalization of 7-Azaindoles via Carbene Transfer and Isolation of <i>N</i>-Aromatic Zwitterions
作者:Junheng Liu、Guangyang Xu、Shengbiao Tang、Qun Chen、Jiangtao Sun
DOI:10.1021/acs.orglett.0c03653
日期:2020.12.4
metal-carbene transfer reaction of 7-azaindoles has been conducted, and the unprecedented dearomative N7-alkylation reaction has been accomplished via ruthenium catalysis. Importantly, through a sequential dearomatization–aromatization process, an isolable, and new class of azaindole-based N-aromatic zwitterions has been discovered from the reaction of 7-azaindoles and diazoesters.
Access to N-Substituted 2-Pyridones by Catalytic Intermolecular Dearomatization and 1,4-Acyl Transfer
作者:Guangyang Xu、Ping Chen、Pei Liu、Shengbiao Tang、Xinhao Zhang、Jiangtao Sun
DOI:10.1002/anie.201812937
日期:2019.2.11
A novel rhodium‐catalyzed dearomatization of O‐substituted pyridines to access N‐substituted 2‐pyridones has been developed. A computational study suggests a mechanism involving the formation of a pyridinium ylide followed by an unprecedented 1,4‐acyl migratory rearrangement from O to C. Furthermore, the chiral dirhodium complexes serve as the catalyst for the asymmetric transformation with excellent
CuI-catalyzed cross-coupling of diazoacetamide with terminal alkynes: an approach to synthesizing substituted dienamides and 3-butynamides
作者:Jian Li、Dong Ding、Li Liu、Jiangtao Sun
DOI:10.1039/c3ra44801k
日期:——
A cross-coupling reaction between diazoacetamide and terminal alkynes has been developed, which provides a practical synthetic strategy for the synthesis of substituted dienamides and 3-butynamides under mild reaction conditions.
A highly enantioselective Darzens reaction between diazoacetamides and aldehydes catalyzed by a (+)-pinanediol–Ti(OiPr)4 system
作者:Gang Liu、Daming Zhang、Jian Li、Guangyang Xu、Jiangtao Sun
DOI:10.1039/c2ob27179f
日期:——
A highly efficient enantioselective Darzens reaction of aldehydes with diazoacetamides catalyzed by a (+)-pinanediol–Ti(OiPr)4 system has been developed. The cis-glycidic amides were obtained in high yields and with moderate to excellent enantioselectivity (up to 99%).
已经开发了由(+)-ane二醇-Ti(O i Pr)4系统催化的醛与重氮乙酰胺的高效对映选择性Darzens反应。所述CIS以高收率得到,并与中度至良好的对映选择性(高达99%) -缩水甘油酰胺。
Controlled Diastereo- and Enantioselection in a Catalytic Asymmetric Aziridination
作者:Aman A. Desai、William D. Wulff
DOI:10.1021/ja1038648
日期:2010.9.29
the development of an unprecedented universal catalyticasymmetricaziridination protocol. The substrate scope is broad and includes iminespreparedfrom both electron-rich and electron-poor aromatic aldehydes and also from 1°, 2°, and 3° aliphatic aldehydes. The face selectivity of the addition to the imine was found to be independent of the diazo compounds. The (S)-VANOL or (S)-VAPOL derived catalyst