Process Development of 5-Methoxy-1H-indole-2-carboxylic Acid from Ethyl 2-Methylmalonate
摘要:
Development is described of a new process for the preparation from malonates of 5-methoxy-1H-indole-2-carboxylic acid esters, useful intermediates in the synthesis of pharmaceutical compounds. The process uses readily available starting materials, produces little waste, can be operated safely on at least 1 molar scale, and gives high yields. The main areas of optimization included the azo coupling of a diazonium salt with malonate derivatives, the Japp-Klingemann rearrangement, and the Fischer indole synthesis.
Rh(II)-catalyzed intramolecular annulation of N-sulfonyl 1,2,3-triazoles with indole derivatives: a new method for synthesis pyranoindoles
作者:Hui Xie、Jian-Xin Yang、Pranjal Protim Bora、Qiang Kang
DOI:10.1016/j.tet.2016.04.017
日期:2016.6
for the synthesis of Z-alkenyl-pyranoindoles had been developed by utilizing Rh(II)-catalyzed intramolecular cyclization of N-sulfonyl-1,2,3-triazoles with indole derivatives. A variety of pyranoindoles were obtained in 44–93% yields. Moreover, a more convenient synthesis of pyranoindoles starting from terminal alkyne was realized via a Cu–Rh sequentiallycatalyzed one-pot cascade reaction.
Pappalardo; Vitali, Gazzetta Chimica Italiana, 1958, vol. 88, p. 574,589
作者:Pappalardo、Vitali
DOI:——
日期:——
543. Experiments on the synthesis of Bz-substituted indoles and tryptophans. Part II. Attempted syntheses of Bz-nitro-indoles and -tryptophans. the synthesis of 5-ethoxytryptophan and of 4 : 5- and 6 : 7-benzotryptophan
作者:H. N. Rydon、S. Siddappa
DOI:10.1039/jr9510002462
日期:——
Hughes; Lions, Journal and Proceedings - Royal Society of New South Wales, 1937, vol. 71, p. 475,482