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hsiaoeng.221新虫 (小有名气)
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[求助]
求翻译一句话
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the chirality sensing is based on spontaneous asymmetric transformation of the first kind with stereolabile binaphtholate boron and zinc complexes. the steadily increasing efficiency in asymmetric synthesis has shifted focus toward the development of time efficient optical techniques with potential for high-throughput screening. [ 发自手机版 https://muchong.com/3g ] |
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hsiaoeng.221
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求翻译Recently, Anslyn, James, and Bull introduced an attractive assay for the detection and ee analysis of primary amines that is based on a three-component assembly with enantiopure atropos BINOL and 2-formylphenylboronic acid.23 We assumed that the covalent binding of monoamines via condensation with a 2- formyl-4-methoxyphenylborate complex carrying binaphtholate 2 would yield a strong CD output originating from asymmetric amplification in our probe. Indeed, weak CD signals below 300 nm were obtained from the condensation product of 2-formyl-4- methoxyphenylboronic acid 31 and amines 11, 32, and 33, respectively. This largely changed when the same reaction was performed in the presence of 1 equiv of 2, and we observed significantly enhanced Cotton effects at higher wavelengths (Figure 3 and SI). This approach eliminates the use of enantiopure BINOL and solely relies on chiral amplification based on central-to-axial chirality induction with stereolabile binaphthol 2 serving as the CD reporter unit. Compared to the general chirality sensing method with B(OMe)3 and 2 described above, the three-component assembly with 31 is limited to substrates having a primary amino group. But it is not applicable to N-methyl ephedrine, 20, and other amines or amino alcohols with secondary or tertiary amino functions. |
8楼2014-04-13 15:54:19
RXMCDM
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2楼2014-02-15 17:16:56
hsiaoeng.221
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3楼2014-02-16 12:17:55
hsiaoeng.221
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4楼2014-02-22 21:58:54
