55747-53-0Relevant articles and documents
Preparation method of melatonin
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Paragraph 0049; 0053-0054; 0079-0082; 0083-0086, (2020/03/03)
The invention relates to the technical field of chemical synthesis of medicines, in particular to a preparation method of melatonin. The preparation method of the melatonin comprises the following steps: (a) subjecting phthalimide, 1,3-dichloropropane, sodium iodide and ethyl acetoacetate to a reaction in a solvent under the action of alkali to obtain a compound I; (b) performing a ring closing reaction on the compound I and p-methoxyphenyl diazonium salt in the presence of alkali and a solvent to obtain a compound II; (c) hydrolyzing the compound II under an alkaline condition, and carrying out decarboxylating under an acidic condition to obtain a compound III; and (d) carrying out an acetylation reaction on the compound III to obtain melatonin. According to the preparation method, phthalimide, 1,3-dichloropropane, ethyl acetoacetate and the like are used as raw materials, and the price of the raw materials is low; the intermediate compound I can be obtained through a one-step method,so reaction steps and time are shortened; moreover, the conditions of each reaction step are relatively mild, the raw materials are easy to obtain, and high yield can be obtained.
PTC-promoted Japp-Klingmann reaction for the synthesis of indole derivatives
He, Wei,Zhang, Bang-Le,Li, Zhong-Jie,Zhang, Sheng-Yong
, p. 1359 - 1368 (2007/10/03)
Indole derivatives have been efficiently synthesized from ethyl 2-phenylhy-drazono-5-phthalimido-pentanoate and its derivatives, which were obtained by Japp-Klingmann reaction under phase-transfer catalytic (PTC) conditions. Several different phase-transf
Process research and development of melatonin
Prabhakar,Kumar, N. Vasanth,Reddy, M. Ravikanth,Sarma,Reddy, G. Om
, p. 155 - 160 (2013/09/08)
A short, simple, and industrially feasible process for the preparation of melatonin (N-acetyl-5-methoxy tryptamine), starting from phthalimide and 1-bromo-3-chloropropane, in essentially four steps is discussed. The present article elucidates the preparative process along with the impurity profile of each intermediate.