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
作者:O. P. Shestak、N. N. Balaneva、V. L. Novikov、V. P. Glazunov
DOI:10.1007/s11172-024-4328-1
日期:2024.7
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 methylethers of polyhydroxynaphthazarins.
原乙酸三甲酯 (MeC(OMe) 3 , TMOA) 是一种方便的试剂,可选择性和完全 O-甲基化海胆色素的 β-OH 基团,例如菠那素、旋色素 D 和 E 以及棘色素 A。与TMOA的化合物可以提供制备量的刺色素D和棘色素A的6-单甲醚、刺色素E的7-单甲醚(namakochrome)和刺色素E的6,7-二甲醚,这些是通过其他方法难以制备的,并且对所有讨论的颜料进行完全 O-甲基化。在已知的O-甲基化剂中,TMOA最适合用于制备聚羟基萘甲醚的制备合成。