Synthesis of new carbamate derivatives of indole and their modification
作者:A. V. Velikorodov、A. K. Kuanchalieva、O. L. Titova
DOI:10.1134/s107042801007016x
日期:2010.7
Oximation of indoles having a methoxycarbonylamino group on C(5) and an acyl group on C(3) with hydroxylamine hydrochloride in the presence of pyridine gave the corresponding oximes. The reduction of the 3-C=O group with sodium tetrahydridoborate in the presence of sodium hydroxide was accompanied by removal of the methoxycarbonyl group at the pyrrole nitrogen atom with formation of racemic alcohols. 1,4-Addition of 1-(pyridin-3-yl)butane-1,3-dione to dimethyl 1,4-benzoquinone diimine N,N'-dicarboxylate in dioxane in the presence of sodium methoxide, followed by heating in boiling 22% hydrochloric acid, afforded methyl 2-methyl-5-(methoxycarbonylamino)-3-(pyridin-3-ylcarbonyl)-1H-indole-1-carboxylate. 3-(Dimethylamino)-1-(4-methyl-1,2,5-oxadiazol-3-yl)prop-2-en-1-one reacted with N,N'-bis(methoxycarbonyl)- and N,N'-bis(phenylsulfonyl)-1,4-benzoquinone diimines in methylene chloride and acetic acid, respectively, in the presence of BF(3) center dot Et(2)O to produce indoles having a 1,2,5-oxadiazolylcarbonyl group on C(3).
Nenitzescu synthesis of carbamate indole derivatives from N,N′-bis(methoxycarbonyl)-p-benzoquinone diimine
作者:A. M. Borisov、N. A. Kamanina、A. V. Velikorodov
DOI:10.1134/s1070428007030141
日期:2007.3
N,N'-B s(methoxycarbonyl)-p-benzoquinone diimine reacted with 4-(cyclohex-1-en-1-yl)- and 4-(cyclopent-1-en-1-yl)morpholines in methylene chloride at room temperature to give morpholino-substituted cyclohexane- and cyclopentane-fused indole derivatives. Heating of the latter in boiling 10% hydrochloric acid led to the formation of methyl 6-(methoxycarbonylamino)-1,2,3,4,4a,9a-hexahydro-9H-carbazole-9-carboxylate and methyl 7 -(methoxycarbonylamino)-1,2,3,3a,4,8b-hexahydrocyclopenta[b]indole-4-carboxylate, respectively. The reaction of N,N'-bis(methoxycarbonyl)-p-benzoquinone diimine with 4-benzylaminopent-3-en-2-one in CH2Cl2 in the presence of BF3 center dot Et2O on heating gave methyl 3-acetyl-2-methyl-(5-methoxy-carbonylamino)-1H-indole-1-carboxylate.