Palladium-catalyzed synthesis of 1,2-dihydro-4(3H)-carbazolones. Formal total synthesis of murrayaquinone A
摘要:
Two sequential palladium-catalyzed reactions are the key steps in a novel synthetic route to 1,2-dihydro-4(3H)-carbazolones. The steps are an intermolecular Stille cross-coupling followed by a reductive N-heteroannulation. A formal total synthesis of murrayaquinone A, employing this sequence, is reported. (C) 2003 Elsevier Ltd. All fights reserved.
SAR Studies of 3-Cyclopropanecarbonyloxy-2-cyclohexen-1-one as Inhibitors of 4-Hydroxyphenylpyruvate Dioxygenase
作者:Yung-Lung Lin、Chung-Shieh Wu、Shean-Woei Lin、Jian-Lin Huang、Yang-Sheng Sun、Ding-Yah Yang
DOI:10.1016/s0968-0896(01)00322-4
日期:2002.3
Various 3-cyclopropanecarbonyloxy-2-cyclohexen-1-one 1 derivatives have been synthesized and tested as inhibitors of 4-hydroxyphenylpyruvate dioxygenase (4-HPPD) from pig liver. The inhibition results indicated that well-positioned dicarbonyl groups as well as the cyclopropyl group of 1 were essential for potent inhibition. Substitution at the 2-position of the ring system has a significant effect
Synthesis of 1,2,3,4-tetrahydrocarbazoles and related tricyclic indoles
作者:Tricia L. Scott、Nicholas Burke、Grissell Carrero-Martínez、Björn C.G. Söderberg
DOI:10.1016/j.tet.2006.11.052
日期:2007.1
Reduction of 2-(2-nitrophenyl)-2-cyclohexene-1-ones using palladium on carbon under 1 atm of hydrogen gas at ambient temperature affords 1,2,3,4-tetrahydrocarbazoles in excellent isolated yields. The starting materials were prepared by intermolecular Stille coupling of 2-iodo-2-cyclohexen-1-ones with 2-(tributylstannyl)-1-nitrobenzenes.
of nucleophiles, involves the generation of an intermediate hydroxylate followed by the regioselective formation and fragmentation of an intermediate lactolate into enolate. This strategy, devoid of any protecting group, enlarges the initial ring and provides an original access to decorated 9‐membered lactones with a fused indole unit.
produced cyclic hydroxamates. The reaction proceeded via photoinduced oxygen transfer from the nitro group to the benzylic position, forming an α-hydroxyketone having a nitroso group. Subsequent addition of the nitroso group to the ketone moiety and the concomitant cleavage of the C–C σ bond between the carbonyl group and the benzyl position produced hydroxamicacid, which underwent formation of a hemiacetal