Syntheses of coenzyme Q(3-8) are described, as well as related systems such as plastoquinone-5. Preparation of thr higher homologues of the ubiquinones relies on two new conjunctive reagents, or "linchpins", each of which ultimately corresponds to two or three prenyl units. These allow for attachment of a polyprenyl halide at one end, followed by a Ni(0)-catalyzed cross-coupling at the other terminus with a chloromethylated p-quinone.
Photochemical Reaction of Ubiquinone (35). VI. Coenzymatic Activity of Ubiquinone (35) and Related Compounds
作者:Isuke Imada、Hiroshi Morimoto
DOI:10.1248/cpb.13.136
日期:——
1) Using the mitochondria treated with acetone, measurement was made about the activity-restoring effect of ubiquinone (35)(I) and related compounds on the succinate oxidase system, and as the partial structure required for the effect the following points were made clear : i) the quinone nucleus is necessary, ii) the methoxyl at position of 3 may be changed to a hydroxyl but if it is converted to acetoxyl the effect is lost, iii) the length of the isoprene side chain has no influence so long as the number of the isoprene is 7∼10, but when the double bonds of the side chain are saturated, the activity decreases to 1/2, and when one of the double bonds is conjugated with the quinone nucleus, the activity lowers to 1/3. 2) When added to beef-heart mitochondria, some substances in Table IV other than ubiquinone (35)(I) and ubichromenol (35) acetate (IX) show slight inhibition of the succinate oxidase system.
1) 利用用丙酮处理过的线粒体,测定了泛醌(35)(I)和相关化合物对琥珀酸氧化酶系 统的活性恢复作用:i)醌核是必要的;ii)3 位上的甲氧基可以转变为羟基,但如果转变为乙酰氧基,则失去作用;iii)只要异戊二烯的数目为 7∼10 个,异戊二烯侧链的长度就没有影响,但当侧链的双键饱和时,活性降低到 1/2,当其中一个双键与醌核共轭时,活性降低到 1/3。2)表 IV 中除泛醌(35)(I)和醋酸泛醌(35)(IX)以外的一些物质加入牛心线粒体后,对琥珀酸氧化酶系统有轻微的抑制作用。
Regio- and stereoselective synthesis of coenzymes Qn (n = 2-10), vitamin K, and related polyprenylquinones
作者:Yoshinori Naruta
DOI:10.1021/jo01309a006
日期:1980.10
Terao,S. et al., Journal of the Chemical Society. Perkin transactions I, 1978, p. 1101 - 1110
作者:Terao,S. et al.
DOI:——
日期:——
Terao, Shinji; Shiraishi, Mitsuru; Kato, Kaneyoshi, Journal of the Chemical Society. Perkin transactions I, 1982, # 12, p. 2909 - 2920