Diversity-Oriented Synthesis of Functionalized 1-Aminopyrroles by Regioselective Zinc Chloride-Catalyzed, One-Pot ‘Conjugate Addition/Cyclization’ Reactions of 1,3-Bis(silyl enol ethers) with 1,2-Diaza-1,3-butadienes
convenient one-pot process, the easily accessible 1,2-diaza-1,3-butadienes and 1,3-bis(silyl enolethers) are converted into the previously unknown functionalized 1-aminopyrroles and 1-amino-4,5,6,7-tetrahydroindoles. The domino reaction proceeds through a zinc chloride-catalyzed ‘conjugate addition/cyclization’ sequence.
Synthesis of 2-Alkylidenepyrrolidines, Pyrroles, and Indoles by Condensation of Silyl Enol Ethers and 1,3-Bis-Silyl Enol Ethers with 1-Azido-2,2-dimethoxyethane and Subsequent Reductive Cyclization
作者:Esen Bellur、Helmar Görls、Peter Langer
DOI:10.1021/jo047856x
日期:2005.6.1
The condensation of 1,3-bis-silylenolethers with 1-azido-2,2-dimethoxyethane and subsequent reductive cyclization allowed an efficient regio- and diastereoselective synthesis of a variety of 2-alkylidene-4-methoxypyrrolidines. The thermal elimination of methanol resulted in the formation of functionalized pyrroles. Similarly, 2,3,3a,4,5,6-hexahydro-2,3-benzopyrroles were prepared and transformed
Chemo- and regio-selective synthesis of functionalized 3(2H)-furanones by the first cyclization reactions of 1,3-bis(trimethylsiloxy)buta-1,3-dienes with α-chlorocarboxylic acid chlorides
作者:Peter Langer、Thilo Krummel
DOI:10.1039/b001529f
日期:——
Reaction of 1,3-bis(trimethylsiloxy)buta-1,3-dienes with
α-chlorocarboxylic acid chlorides resulted in chemo- and
regio-selective formation of 6-chloro-3,5-dioxoesters which were
regioselectively converted into functionalized
3(2H)-furanones.
Domino Reactions of 1,3-Bis-Silyl Enol Ethers with Benzopyrylium Triflates: Efficient Synthesis of Fluorescent 6H-Benzo[c]chromen-6-ones, Dibenzo[c,d]chromen-6-ones, and 2,3-Dihydro-1H-4,6-dioxachrysen-5-ones
作者:Bettina Appel、Nehad N. R. Saleh、Peter Langer
DOI:10.1002/chem.200501024
日期:2006.1.23
condensation of 1,3-bis-silylenolethers with benzopyrylium triflates, generated in situ by the reaction of chromones with Me3SiOTf, afforded functionalized 2,3-dihydrobenzopyrans; treatment of the latter with NEt3 or BBr3 resulted in a domino retro-Michael-aldol-lactonization reaction and the formation of a variety of 7-hydroxy-6H-benzo[c]chromen-6-ones. The hydroxy group was functionalized by using Suzuki
Synthesis of 1-azaxanthones by condensation of 1,3-bis(trimethylsilyloxy)-1,3-butadienes with 3-(cyano)benzopyrylium triflates and subsequent domino ‘retro-Michael/nitrile-addition/heterocyclization’ reaction
Functionalized 1-azaxanthones (5-oxo-5H-[1]-benzopyrano[2,3-b]pyridines) were prepared by TMSOTf-mediated condensation of 1,3-bis(trimethylsilyloxy)-1,3-butadienes with 3-cyanochromones and subsequent base-mediated domino ‘retro-Michael/nitrile-addition/heterocyclization’ reaction.
通过TMSOTf介导的1,3-双(三甲基甲硅烷氧基)-1,3-丁二烯与3的缩合反应制备功能化的1-azaxanthones(5-oxo-5 H- [1]-苯并吡喃并[2,3- b ]吡啶)。 -氰基色酮和随后的碱基介导的多米诺骨牌“复古迈克尔/腈加成/杂环化”反应。