Enantioselective Reductive Divinylation of Unactivated Alkenes by Nickel-Catalyzed Cyclization Coupling Reaction
作者:Jin-Bao Qiao、Ya-Qian Zhang、Qi-Wei Yao、Zhen-Zhen Zhao、Xuejing Peng、Xing-Zhong Shu
DOI:10.1021/jacs.1c05670
日期:2021.8.25
benzene-fused compounds. Herein, we report an enantioselective cross-electrophile divinylation reaction of nonaromatic substrates, 2-bromo-1,6-dienes. The approach thus offers a route to new chiral cyclic architectures, which are key structural motifs found in various biologically active compounds. The reaction proceeds under mild conditions, and the use of chiral t-Bu-pmrox and 3,5-difluoro-pyrox ligands
The simple primary β-amino alcohol catalyzedDiels-Alderreaction of 3-hydroxy-2-pyridones as dienes with N-substituted maleimides to provide the highly substituted optically active isoquinuclidines as a single diastereomers in excellent enantioselectivities (up to 98%) with excellent chemical yields (up to 95%) was demonstrated. A range of simple β-amino alcohols were synthesized from the corresponding
Pd(II)-Catalyzed Asymmetric Oxidative Annulation of <i>N</i>-Alkoxyheteroaryl Amides and 1,3-Dienes
作者:Tao Zhang、Hong-Cheng Shen、Jia-Cheng Xu、Tao Fan、Zhi-Yong Han、Liu-Zhu Gong
DOI:10.1021/acs.orglett.9b00216
日期:2019.4.5
The first Pd(II)-catalyzedasymmetric oxidative annulation of N-alkoxyaryl amides and 1,3-dienes is reported, which features particular applicability for quick assembly of different types of chiral heterocycles with high yields and enantioselectivities. A novel chiral pyridine-oxazoline bearing a methoxyl group at the C-5 position and a gem-dimethyl group on the oxazoline moiety was found to be crucial
A highly enantioselective Diels–Alder reaction of 1,2-dihydropyridine using a simple β-amino alcohol organocatalyst for a practical synthetic methodology of oseltamivir intermediate
An easily prepared chiral amino alcohol catalyst was found to provide an efficient synthetic intermediate of oseltamivir with excellent chemical yield and enantioselectivity (up to 98% yield and up to 98% ee) in enantioselective Diels-Alder reactions of 1,2-dihydropylidines with acroleins. (C) 2011 Elsevier Ltd. All rights reserved.
Enantioselective Diels–Alder Reaction of 1,2-Dihydropyridines with Aldehydes Using β-Amino Alcohol Organocatalyst
The enantioselective Diels Alder reaction of 1,2-dihydropyridines with aldehydes using an easily prepared optically active beta-amino alcohol catalyst was found to provide optically active isoquinuclidines, an efficient synthetic intermediate of pharmaceutically important compounds such as oseltamivir phosphate, with a satisfactory chemical yield and enantioselectivity (up to 96%, up to 98% ee). In addition, the obtained highly optically pure isoquinuclidine was easily converted to an optically active piperidine having four successive carbon centers.