乙缩醛保护的(2,4-Dioxocyclohex-1-yl)乙酰胺的酸催化环化反应合成2,6-二氧-1,2,3,4,5,6-六氢吲哚并将其转化为5,8, 9,10-四氢-6 H-吲哚并[2,1- a ]异喹啉-9-一
摘要:
Abstractmagnified imageAcetal‐protected (2,4‐dioxocyclohex‐1‐yl)acetic acids were prepared by allylation of dilithiated 1,3‐cyclohexane‐1,3‐diones, protection of the carbonyl groups and oxidation of the alkene moiety. Their reaction with amines afforded the corresponding amides which were transformed, by acid‐catalyzed cyclization, into various 2,6‐dioxo‐1,2,3,4,5,6‐hexahydroindoles. The reaction of the latter with triflic acid resulted in the formation of novel 5,8,9,10‐tetrahydro‐6H‐indolo[2,1‐a]isoquinolin‐9‐ones.
Efficient synthesis of 2,6-dioxo-1,2,3,4,5,6-hexahydroindoles based on the synthesis and reactions of (2,4-dioxocyclohex-1-yl)acetic acid derivatives
摘要:
Acetal-protected (2,.4-dioxocyclohex-1-yl)acetic acid derivatives were prepared by the allylation of dilithiated 1,3-cyclohexane-1,3-diones, by the protection of the carbonyl groups and by the oxidation of the alkene. The products were then transformed, by amide formation and subsequent cyclization, into 2,6-dioxo-1,2,3,4,5,6-hexahydroindoles, which represent important intermediates for the synthesis of various alkaloids. (C) 2008 Elsevier Ltd. All rights reserved.
Synthesis of 2,6-Dioxo-1,2,3,4,5,6-hexahydroindoles by Acid- Catalyzed Cyclization of Acetal-Protected (2,4-Dioxocyclohex-1-yl)acetamides and their Transformation into 5,8,9,10-Tetrahydro-6<i>H</i>-indolo[2,1-<i>a</i>]isoquinolin-9-ones
Abstractmagnified imageAcetal‐protected (2,4‐dioxocyclohex‐1‐yl)acetic acids were prepared by allylation of dilithiated 1,3‐cyclohexane‐1,3‐diones, protection of the carbonyl groups and oxidation of the alkene moiety. Their reaction with amines afforded the corresponding amides which were transformed, by acid‐catalyzed cyclization, into various 2,6‐dioxo‐1,2,3,4,5,6‐hexahydroindoles. The reaction of the latter with triflic acid resulted in the formation of novel 5,8,9,10‐tetrahydro‐6H‐indolo[2,1‐a]isoquinolin‐9‐ones.
Efficient synthesis of 2,6-dioxo-1,2,3,4,5,6-hexahydroindoles based on the synthesis and reactions of (2,4-dioxocyclohex-1-yl)acetic acid derivatives
Acetal-protected (2,.4-dioxocyclohex-1-yl)acetic acid derivatives were prepared by the allylation of dilithiated 1,3-cyclohexane-1,3-diones, by the protection of the carbonyl groups and by the oxidation of the alkene. The products were then transformed, by amide formation and subsequent cyclization, into 2,6-dioxo-1,2,3,4,5,6-hexahydroindoles, which represent important intermediates for the synthesis of various alkaloids. (C) 2008 Elsevier Ltd. All rights reserved.