Photocatalysis of a [2+2] Cycloaddition in Aqueous Solution Using DNA Three‐Way Junctions as Chiral PhotoDNAzymes
Photocatalysis of a [2+2] Cycloaddition in Aqueous Solution Using DNA Three‐Way Junctions as Chiral PhotoDNAzymes
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使用 DNA 三向连接作为手性光 DNA 酶在水溶液中进行 [2 2] 环加成的光催化
DOI:
10.1002/cptc.201600034
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发表时间:
2017
期刊:
影响因子:
--
通讯作者:
H.-A. Wagenknech
中科院分区:
文献类型:
--
作者:
N. Gaß;J. Gebhard;H.-A. Wagenknech
Two DNA three‐way junctions bearing 4‐methylbenzophenone and 4‐methoxybenzophenone asC‐nucleosides at the hydrophobic binding pocket were synthesized. They were applied as aptamers and photoDNAzymes to gain enantioselectivity for the photosensitized intramolecular [2+2] cycloaddition of a quinolinone substrate in aqueous solution. Irradiation by two λ=369 nm LEDs for 10 h yielded 58 % of the regioisomeric product mixture with an enantiomeric excess of 28 %. The enantiomeric excess in the presence of the three‐way junction with 4‐methylbenzophenone yields higher enantiomeric excess than that with 4‐methoxybenzophenone which can be explained by differences in binding of the substrate according to melting temperature analysis. This is the first time that the chirality of double‐stranded DNA can be transferred to an asymmetric photosensitized reaction and opens the way for in vivo applications of chiral photosensitizing in biology.
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DOI:
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发表时间:
2001
期刊:
影响因子:
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作者:
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DOI:
--
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2006
期刊:
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--
发表时间:
1987
期刊:
影响因子:
--
作者:
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