- (-)-Effective the mildew is mellow azide tetraethyl ester preparation method
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The invention discloses a method for preparing (-)- effective mildew alcohol azide tetacetic acid ester. The method comprises the following steps: firstly, taking (+)- effective mildew alcohol amino as a raw material, converting the amino group in the (+)
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Paragraph 0021; 0035-0039
(2017/03/17)
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- Synthesis of 1,2,3-triazoles from azide-derivatised aminocyclitols by catalytic diazo transfer and CuAAC click chemistry
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CuII-catalysed diazo transfer and CuI-catalysed azide-alkyne 1,3-dipolar cycloaddition (CuAAC) "click chemistry" were used to synthesis C7N aminocyclitol-derivatised 1,2,3-triazoles. In the course of this work, the -N=N- moiety was transferred onto C7N aminocyclitols such as validamine, valienamine and valiolamine by employing imidazole-1-sulfonyl azide as the diazo transfer reagent with catalysis by CuII, ZnII and NiII, in moderate to good yields. The obtained azidocyclitols were coupled with various terminal alkynes under modified Meldal's conditions with good to excellent yields. The stereo- and regiochemistry of the products were confirmed by 2D-NMR (NOESY and HMBC). One-pot syntheses of the corresponding 1,2,3-triazoles, as safer and more efficient procedures, were also investigated and gave moderate to good yields. Copyright
- Ji, Li,Zhou, Guo-Quan,Qian, Chao,Chen, Xin-Zhi
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supporting information
p. 3622 - 3636
(2014/06/23)
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- Total syntheses of (+)-valiolamine and (-)-1-epi-valiolamine from naturally abundant (-)-shikimic acid
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Total syntheses of (+)-valiolamine (1) and (-)-1-epi-valiolamine (2) from the naturally abundant (-)-shikimic acid are described. Ethyl 3-epi-5-O-methylsulfonyl-shikimate (3), as the key common intermediate, was first synthesized in five steps in 74 % overall yield, and then converted into the targets 1 and 2 in seven steps in 48 and 41 % overall yield, respectively. Copyright
- Quan, Na,Nie, Liang-Deng,Zhu, Rui-Heng,Shi, Xiao-Xin,Ding, Wei,Lu, Xia
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p. 6389 - 6396
(2013/10/21)
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- Synthesis and Trehalose-inhibitory Activity of an Imino-linked Dicarba-&α,&α-trehalose and Analogues thereof
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Dicarba-α,α-trehalose 2a, bis-(5a-carba-α-D-glucopyranosyl)amine, was prepared by the coupling of di-O-isopropylidene-α-validamine 5 and protected carba-sugar epoxide 7, followed by removal of the 2'-hydroxy group and conventional deprotection.Likewise, i
- Ogawa, Seiichiro,Sato, Koji,Miyamoto, Yasunobu
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p. 691 - 696
(2007/10/02)
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