Naphthoquinoid pigments of sea urchins. Trimethyl orthoacetate as an effective reagent for O-methylation of β-OH groups of spinazarin, spinochromes D and E, and echinochrome A
O. P. Shestak, N. N. Balaneva, V. L. Novikov, V. P. Glazunov
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引用次数: 0
Abstract
Trimethyl orthoacetate (MeC(OMe)3, TMOA) is a convenient reagent for both selective and complete O-methylation of the β-OH groups of sea urchin pigments such as spinazarin, spinochromes D and E, and echinochrome A. The reactions of these compounds with TMOA make it possible to furnish preparative amounts of 6-monomethyl ethers of spinochrome D and echinochrome A, 7-monomethyl ether (namakochrome) and 6,7-dimethyl ether of spinochrome E, which are difficult to prepare by other methods, and to carry out complete O-methylation of all discussed pigments. Among the known O-methylating agents, TMOA is most suitable for the preparative syntheses of methyl ethers of polyhydroxynaphthazarins.
海胆的萘醌类色素。原乙酸三甲酯作为一种有效的试剂，用于对尖晶石色素、尖晶石色素 D 和 E 以及回声色素 A 的 β-OH 基团进行 O-甲基化反应
原乙酸三甲酯（MeC(OMe)3, TMOA）是一种方便的试剂，可用于选择性地完全 O-甲基化海胆色素（如菠菜素、棘色素 D 和 E 以及回声色素 A）的 β-OH 基团。通过这些化合物与 TMOA 的反应，可以制备出用其他方法难以制备的尖晶石色素 D 和棘晶石色素 A 的 6-单甲基醚、7-单甲基醚（namakochrome）和尖晶石色素 E 的 6,7-二甲基醚，并对所有讨论过的色素进行完全的 O-甲基化反应。在已知的 O-甲基化剂中，TMOA 最适合用于制备多羟基萘酞菁甲基醚的合成。
期刊介绍：
Publishing nearly 500 original articles a year, by leading Scientists from Russia and throughout the world, Russian Chemical Bulletin is a prominent international journal. The coverage of the journal spans practically all areas of fundamental chemical research and is presented in five sections:
General and Inorganic Chemistry;
Physical Chemistry;
Organic Chemistry;
Organometallic Chemistry;
Chemistry of Natural Compounds and Bioorganic Chemistry.
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