New Three-Component Glyoxylation-Decarbonylative Stille Coupling Sequence to Acyl Heterocycles under Mild Conditions
作者:Thomas Müller、Boris Tasch、Eugen Merkul、Walter Frank
DOI:10.1055/s-0029-1218802
日期:2010.7
A consecutive sequence of glyoxylation of 1-methyl-1H-indole, 1-(4-methoxybenzyl)-1H-pyrrolo[2,3-b]pyridine or N-substituted pyrroles with oxalyl chloride and subsequent decarbonylative Stille coupling under very mild, Lewis acid free conditions using all reactants in equimolar quantities is reported. As an illustration, this glyoxylation-decarbonylative couplingsequence was elaborated into a consecutive
1-甲基-1 H-吲哚,1-(4-甲氧基苄基)-1 H-吡咯并[2,3- b ]吡啶或N-取代的吡咯与草酰氯的乙氧基化连续序列,随后在非常低的温度下进行脱羰Stille偶联报道了使用所有等摩尔量反应物的温和,无路易斯酸条件。作为说明,该乙氧基化-脱羰基偶联序列被精加工为1-甲基-3-(1-甲基-4,5-二氢-1 H-吡唑-3-基)-1 H的连续四组分合成-吲哚乙醛酸化-脱羰基Stille反应-多组分反应-CC偶联-酰基杂环
Four- and Five-Component Syntheses and Photophysical Properties of Emission Solvatochromic 3-Aminovinylquinoxalines
作者:Charlotte F. Gers-Panther、Henry Fischer、Jan Nordmann、Theresa Seiler、Thomas Behnke、Christian Würth、Walter Frank、Ute Resch-Genger、Thomas J. J. Müller
DOI:10.1021/acs.joc.6b02581
日期:2017.1.6
(hetero)aryl glyoxylic acids or heterocyclic π-nucleophiles by consecutive four- and five-component syntheses in the sense of an activation-alkynylation-cyclocondensation-addition sequence or glyoxylation-alkynylation-cyclocondensation-addition sequence in good yields. The title compounds are highly fluorescent with pronounced emission solvatochromicity and protochromic fluorescence quenching. Time-resolved
Gold(I)-Catalyzed Cycloisomerization–Indole Addition Cascade: Synthesis of 3(2<i>H</i>)-Furanone-Incorporated Unsymmetrical 3,3′- Bis(indolyl)methanes
作者:Debojyoti Bag、Sanghapal D. Sawant
DOI:10.1021/acs.orglett.2c01845
日期:2022.7.15
Au(I)-catalyzed domino intramolecular carbonyl-alkyne cyclization/indole addition strategy has been disclosed here. This generalized strategy enables the synthesis of 3(2H)-furanone-incorporated unsymmetrical bis(indolyl)methanes with generation of a stereocenter at the furanone junction from easily accessible indole-tethered ynediones. In addition, this present protocol could also be extended for the synthesis
这里公开了一种前所未有的 Au(I) 催化的多米诺分子内羰基-炔烃环化/吲哚加成策略。这种通用策略能够合成掺入 3(2 H )-呋喃酮的不对称双(吲哚基)甲烷,并在呋喃酮连接处从容易获得的吲哚系链内二酮生成立体中心。此外, 本协议还可以通过使用各种 (杂) 芳烃作为亲核偶联伙伴来扩展合成许多吲哚基-(杂) 芳基甲烷。
Decomposition of Alkynyl Hydrazones: Synthesis of Allenoates, Dihaloallenoates, and Angularly Fused Tricyclic Azepines
provided allenoates, tetrasubstituted α,γ-dihaloallenoates, and functionalized tricyclic azepines. A reaction of alkynyl hydrazones with N-halosuccinimides captures the electrophile in 2-fold that delivers fully substituted dibromo- and diiodoallenoates in good yields. In addition, a DABCO-promoted Wolff–Kishner reduction of hydrazones, followed by isomerization, provides versatile allenoates under mild conditions
A highly practical and stereoselective route to 1,4-dicarbonyl 2,3-dihaloalkenes is presented. The strategy involves bench-stable unprotected alkynyl hydrazones and commercially available N-halosuccinimides that provide γ-oxo-α,β-(Z)-dihaloenoates in excellent yields with complete Z-selectivity. The protocol also furnishes vicinal dihaloalkenes with two different halogen atoms. Also, a straightforward
提出了一种高度实用且立体选择性的 1,4-二羰基 2,3-二卤代烯烃合成路线。该策略涉及实验室稳定的未保护的炔基腙和市售的N -卤代琥珀酰亚胺,它们以优异的收率提供具有完全Z选择性的 γ-氧代-α,β-( Z )-二卤代烯酸酯。该方案还提供了具有两个不同卤素原子的邻位二卤代烯烃。此外,还证明了从容易获得的 2-氧代-3-丁酸中直接一锅法合成二卤代烯酸。此外,还探索了 4-oxo-2,3-dibromoenoates 的潜在合成转化,其中包括有价值的五元和六元杂环的合成。