Preparation of regio- and stereoisomeric di- and tetrahydrogeranylgeraniols and identification of esterifying groups in natural (bacterio)chlorophylls
作者:Hitoshi Tamiaki、Kota Nomura、Tadashi Mizoguchi
DOI:10.1016/j.bmc.2017.10.002
日期:2017.12
All regioisomeric di- and tetrahydrogeranylgeraniols possessing the C2C3 double bond were prepared as authentic samples. The synthetic C20-isoprenoid alcohols were separated well by gaschromatography. Based on the chromatographic analysis, the enzymatic reduction pathway of a geranylgeranyl group was investigated to identify the last stage of (bacterio)chlorophyll biosynthesis in phototrophs. The
制备所有具有C 2 C 3双键的区域异构二-和四氢香叶基香叶醇作为真实样品。通过气相色谱法很好地分离了合成的C 20-异戊二烯醇。基于色谱分析,研究了香叶基香叶基的酶促还原途径,以鉴定光养生物中(细菌)叶绿素生物合成的最后阶段。通过从C10 C11到C10H C11(S)H的第一次区域和立体有择加氢,从C6 C7到C6H C7(S)H的第二次和第三C14 C15到C14H的区域和立体有针对性的加氢,将香叶基香叶基三倍还原为植酸基。C15H。还原序列的鉴定完成了天然存在的叶绿素a和细菌叶绿素a的生物合成途径,所述叶绿素a和细菌叶绿素a具有在17-丙酸酯残基中的酯化部分的植酸基。
Caulerpenyne and Related Bis-enol Esters Are Novel-Type Inhibitors of Human 5-Lipoxygenase
作者:Phillipp Richter、Gregor Schubert、Anja Maria Schaible、Levent Cavas、Oliver Werz、Georg Pohnert
DOI:10.1002/cmdc.201402065
日期:2014.4.11
a structurally simplified inhibitor is introduced. The modes of 5‐LO inhibition by CYN and the synthetic inhibitors cannot be assigned to any of the known categories of lipoxygenase inhibitors. These compounds clearly interfere directly with 5‐LO and represent rather small and flexible molecules, with unique structures among 5‐LO inhibitors identified thus far.
The present specification relates to an industrially advantageous process for producing vitamin A derivatives which are useful as medicaments, feed additives, food additives and the like. The process provides vitamin A derivatives, particularly all-trans vitamin A derivatives in high yield and purity.
The present invention provides a novel process for producing 4-acyloxy-2-methyl-2-buten-1-al readily in high yield from a readily available inexpensive industrial starting compound without using special reaction apparatuses and conditions.
Practical synthesis of 1,5-dimethyl substituted conjugated polyenes from geranyl acetate
作者:Yu-Jun Zhao、Teck-Peng Loh
DOI:10.1016/j.tet.2008.03.094
日期:2008.5
A protocol to synthesize 1,5-dimethyl substituted conjugated polyenes via dehydrogenation of geranyl acetate was established. C-5 unit elongation to multi- 1,5-dimethyl substituted conjugated polyenes was also achieved via Horner-Wadsworth-Emmons olefination in good yields and good selectivities. (C) 2008 Elsevier Ltd. All rights reserved.