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Synthetic studies on indoles and related compounds. XII. A simple general method for the C-3 acylation of ethyl indole-2-carboxylates.
作者:YASUOKI MURAKAMI、MASANOBU TANI、MICHIO SUZUKI、KEIZO SUDOH、MIDORI UESATO、KENJIRO TANAKA、YUUSAKU YOKOYAMA
DOI:10.1248/cpb.33.4707
日期:——
Ethyl indole-2-carboxylate (1a) and its derivatives were reacted with various carboxylic acids by using trifluoroacetic anhydride and phosphoric acid (or polyphosphoric acid) to yield effectively the corresponding ethyl 3-acylindole-2-carboxylates (3). However, strongly acidic carboxylic acids and nitrogen-containing carboxylic acids were poor acylating agents. Ethyl 3-acylindole-2-carboxylate (3) could easily be converted to 3-acylindole (5)
乙基
吲哚-2-羧酸酯(1a)及其衍
生物在
三氟乙酸酐和
磷酸(或聚
磷酸)的作用下与多种
羧酸反应,有效地合成了相应的乙基3-酰基
吲哚-2-羧酸酯(3)。然而,强酸性
羧酸和含氮
羧酸的酰化效果较差。乙基3-酰基
吲哚-2-羧酸酯(3)很容易转化为3-酰基
吲哚(5)。
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Murakami, Yasuoki; Tani, Masanobu; Tanaka, Kenjiro, Heterocycles, 1984, vol. 22, # 2, p. 241 - 244
作者:Murakami, Yasuoki、Tani, Masanobu、Tanaka, Kenjiro、Yokoyama, Yuusaku
DOI:——
日期:——
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MURAKAMI, YASUOKI;TANI, MASANOBU;TANAKA, KENJIRO;YOKOYAMA, YUUSAKU, HETEROCYCLES, 1984, 22, N 2, 241-244
作者:MURAKAMI, YASUOKI、TANI, MASANOBU、TANAKA, KENJIRO、YOKOYAMA, YUUSAKU
DOI:——
日期:——
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MURAKAMI, YASUOKI;TANI, MASANOBU;TANAKA, KENJIRO;YOKOYAMA, YUUSAKU, CHEM. AND PHARM. BULL., 36,(1988) N 6, 2023-2035
作者:MURAKAMI, YASUOKI、TANI, MASANOBU、TANAKA, KENJIRO、YOKOYAMA, YUUSAKU
DOI:——
日期:——