已探索了几种带有乙酰基侧链的单和二羟基萘达那林的合成途径。甲氧基萘他林1一直是起始原料。通过从1开始的多个步骤制备的各种适当取代的乙酰氧基萘的光-弗里斯重排,实现酰化作用。进一步的步骤,包括氧化脱甲基,水解和醚裂解反应,产生了所需的单和二羟基取代的乙酰萘。描述了新合成的Spinochrome A 24(一种代表这种萘达那林衍生物的天然色素)。
Trimethyl orthoacetate as a convenient reagent for selective methylation of β-OH groups of (poly)hydroxynaphthazarins
作者:N. N. Balaneva、O. P. Shestak、V. L. Novikov
DOI:10.1007/s11172-019-2415-5
日期:2019.1
Trimethyl orthoacetate was found to be a convenient reagent for methylation of the β-OH groups of (poly)hydroxynaphthazarins. The substrates bearing one β-OH group react with MeC(OMe)3 to give the corresponding methoxy derivatives in 79–89% yields. Depending on the reaction conditions, methylation of substrates with two β-OH groups on the different and the same rings affords either the corresponding
作者:V. P. Glazunov、A. Ya. Tchizhova、O. P. Shestak、G. I. Sopel"nyak、V. Ph. Anufriev
DOI:10.1023/a:1009533403588
日期:——
A set of substituted 2-hydroxy-6(7)-methoxynaphthazarins and 7(8)-hydroxypyranonaphthazarins were synthesized. The IR spectra of 2-hydroxy-6-methoxynaphthazarins and 7-hydroxypyranonaphthazarins, on the one hand, and of 2-hydroxy-7-methoxynaphthazarins and 8-hydroxypyranonaphthazarins, on the other hand, have the characteristic nonoverlapping intervals of stretching vibration frequencies of the beta -hydroxy groups. These regularities confirm the structures of cristazarin and 6-methylcristazarin, which are metabolites of lichen Cladonia cristatella.
[EN] The present invention relates to methods of providing a desired effect to the skin of a mammal using a Maillard initiating reagent with a skin-modifying compound. [FR] La présente invention concerne des procédés permettant d'obtenir un effet souhaité sur la peau d'un mammifère en utilisant une réaction de Maillard avec un composé modifiant la peau.