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有关NOE,CD确定苯丙素类化合物R,S构型 已有2人参与
Irritating δ 4.77 (H-7), δ 4.11 (H-8) showed NOE correlations in the difference Nuclear Overhauser Effect (dNOE) spectrum, which indicated that 1 possessed an erythro relative configuration.
The relative structure was further confirmed by NOESY correlations between H-8/H-2, 7, 6, and H-9(δ 4.40)/H-2, 6. Enzymatic hydrolysis of 1 with cellulase gave the aglycone 1a.
The erythro configuration was also confirmed by the J7, 8-value (3.8 Hz) of 1a
The absolute structure of 1 was determined to be (7S, 8R) based on the negative cotton effects of 1 and 1a in its CD spectrum . The results above identified the structure of 1 as (7S,8R) guaiacylglycerol-8-O-4′-sinapyl ether 9′-O-β-D-glucopyranoside.
这是摘自文献中的一句话,irritating在这里是什么意思?NOE和NOESY 是一回事?用1a 的地方可以用1代替吗?有什么区别?
erythro 和threo 与NOESY(H-8/H-7)关系?
附件两篇类似文献,不理解是如何确认构型?
文献1为黄色标注部分,文献20为化合物2及化合物6,
非常感谢应助的各位专家牛人们 |
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- 附件 1 : (1),7S,8R,568相同,命名参考.pdf
2015-02-23 19:41:08, 238.98 K
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