Abstract:
Imidazo[1,2-a]pyridines are present in numerous biologically active compounds as the core structural motif.Herein,we report an asymmetric interrupted Barton-Zard reaction of electron-deficient imidazo[1,2-a]pyridines with α-substituted isocyanoacetates.The reaction enables the dearomatization of 8-nitroimidazo[1,2-a]pyridines and hence offers straightforward access to an array of optically active highly functionalized imidazo[1,2-a]pyridine derivatives that possess three contiguous stereogenic cen-ters in good yields(up to 98%)with high stereoselectivities(>19:1 dr,>99%ee).It is worth noting that the catalytic system consisting of a chiral squaramide and silver oxide displays remarkable reactivity and stereoselectivity,and a gram-scale reaction is compatible with the catalyst loading of 0.5 mol%.In addi-tion,the synthetic potential of this method was showcased by versatile transformations of the product.
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科学通报(英文版)
ISSN: 1001-6538
CN: 11-1785/N
Year: 2022
Issue: 16
Volume: 67
Page: 1688-1695
1 . 6 4 9
JCR@2016
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ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count: -1
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30 Days PV: 0
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