Direct amination of naphthopurpurin and mompain, sea urchin pigments, and their O-methyl ethers by the reaction with ammonia
作者:O. P. Shestak、V. L. Novikov、V. P. Glazunov
DOI:10.1007/s11172-021-3152-0
日期:2021.4
The regiochemistry of direct amination of 2-hydroxynaphthazarin (naphthopurpurin) and 2,7-dihydroxynaphthazarin (mompain), sea urchin pigments, and their O-methyl ethers by the action of ammonia solutions in H2O and MeOH under mild conditions was studied. The predominant direction of the reactions of all substrates with NH3 was the 1,2-addition of the nucleophile to the C-O group at position 1 of the
研究了在温和条件下,通过氨水在H 2 O和MeOH中的作用,对2-羟基萘他嘌呤(naphthopurin)和2,7-二羟基萘他莫潘(mompain),海胆颜料及其O-甲基醚进行直接胺化的区域化学。用NH所有底物的反应的主要方向3是1,2-加成的亲核试剂到CO组中的醌型环的1位的H随后消除2从α-羟胺中间体O。所得的奎宁胺进一步转化为具有NH 2基团的更稳定的互变异构体。除萘嘌呤外,所有底物均可添加两个NH 3分子形成不同的产物。讨论了所有底物与NH 3的反应机理,以及起始底物和反应产物的质子互变异构问题。