14569-45-0Relevant articles and documents
A convenient and efficient synthesis of naphthazarin
Peng, Ying,Zhou, Wen,Zhang, Min,Wang, Cheng-Dong,Chen, Qian,Jiang, Sheng-Jie,Li, Shao-Shun
, p. 24 - 25 (2011/04/26)
A convenient and efficient synthetic method of the important intermediate naphthazarin is presented starting from 1, 4, 5, 8-tetramethoxynaphthalene in an overall yield of 87%. Compared with the reported synthesis, this method has several advantages. Firstly, the reaction conditions are milder; secondly, the workup of each step is simpler and the yield is considerably higher; thirdly, all the reactions involved in the method are more suitable for large-scale preparations.
Synthetic Anthracyclinones, XIII. Regioselective Synthesis of Digitopurpone and Islandicin by a Combined Diels-Alder and Marschalk Reaction
Tolkiehn, Klaus,Krohn, Karsten
, p. 1575 - 1583 (2007/10/02)
The 1,4-ethanoanthraquinone 5b was obtained by regioselective Diels-Alder reaction of the diene 2 with naphthazarin monoethyl ether (1b) followed by hydroxymethylation of the adduct 3b.Clevage of the ether, retrodiene reaction, and reduction gave digitopurpone (7e).Islandicin (8e) was prepared by a similar sequence starting from 4.Both natural products were free of isomers.