Novel Two-Step Stereoselective Synthesis of (<i>E</i>)-Enamines and 1-Amino-1,3-dienes from Terminal Alkynes
作者:Henri Doucet、Christian Bruneau、Pierre Dixneuf
DOI:10.1055/s-1997-5750
日期:1997.7
(E)-Enamines and 1-amino-1,3-dienes have been prepared by reaction of secondary amines with alk-1-en-1-yl acetates resulting from the ruthenium-catalyzed anti-Markovnikov addition of acetic acid to terminal alkynes and enynes.
Dynamic Covalent Chemistry of Aldehyde Enamines: Bi<sup>III</sup>
- and Sc<sup>III</sup>
-Catalysis of Amine-Enamine Exchange
作者:Yang Zhang、Sheng Xie、Mingdi Yan、Olof Ramström
DOI:10.1002/chem.201702363
日期:2017.9.4
The dynamic exchange of enamines from secondary amines and enolizable aldehydes has been demonstrated in organic solvents. The enamine exchange with amines was efficiently catalyzed by Bi(OTf)3 and Sc(OTf)3 (2 mol %) and the equilibria (60 mm) could be attained within hours at room temperature. The formed dynamic covalent systems displayed high stabilities in basic environment with <2 % by-product
A new strategy to construct allylamines through reductive alkenylation of secondary amides with enamines is reported. The method features the use of trifluoromethanesulfonic anhydride as an activation reagent of amides, and enamines as unconventional alkenylation reagents. In this manner, enamines serve as surrogates of alkene carbanions instead of the classical enolates equivalents. A possible mechanism
Hydro(trispyrazolyl)borato-Ruthenium(II) Diphosphinoamino Complex-Catalyzed Addition of β-Diketones to 1-Alkynes and Anti-Markovnikov Addition of Secondary Amines to Aromatic 1-Alkynes
作者:Hung Wai Cheung、Chau Ming So、Kwok Hung Pun、Zhongyuan Zhou、Chak Po Lau
DOI:10.1002/adsc.201000567
日期:2011.2.11
[Tp=hydro(trispyrazolyl)borate] catalyzes the Markovnikov addition of β-diketones to unactivated 1-alkynes in good to excellent yields. The reaction proceeds under solvent-free and additive-free conditions and the catalyst loading can be reduced down to 0.4 mol%. Complex I (1 mol%) also catalyzes the addition of secondaryamines to aromatic terminal alkynes, unusual anti-Markovnikov products are exclusively
氢(三吡唑基)硼酸钌(II)二膦氨基配合物TpRu [4-CF 3 C 6 H 4 N(PPh 2)2 ](OTf)(I)[Tp =氢(三吡唑基)硼酸]催化Markovnikov加成β-二酮与未活化的1-炔具有良好至极好的收率。反应在无溶剂和无添加剂的条件下进行,催化剂的负载量可降低至0.4mol%。配合物I(1摩尔%)还催化向芳族末端炔烃中添加仲胺,从而形成了独特的反马尔科夫尼科夫产物。
Inverse electron demand Diels-Alder reactions of heterocyclic azadienes: formal total synthesis of streptonigrin
作者:Dale L. Boger、James S. Panek
DOI:10.1021/ja00306a024
日期:1985.10.1
Synthese de streptonigrine par 2 cycloadditions successives: tetrazine-1,2,4,5 dicarboxylate de dimethyle et methoxy-6 nitro-5 quinoleinecarbothioimidate-2 de methyle; [methoxy-6 nitro-5 quinolyl-2]-5 triazine-1,2,4 dicarboxylate-3,6 de dimethyle obtenu et [benzyloxy-2 dimethoxy-3,4 phenyl]-1' propenyl-4 morpholine. Ces 2 cycloadditions sont etudiees sur une serie de composes
合成这些 de streptonigrine par 2 cycloadditions 连续序列: tetrazine-1,2,4,5 dicarboxylate dedimethyle et methoxy-6 nitro-5 quinoleinecarbothioimidate-2 demethyle; [甲氧基-6 硝基-5 quinolyl-2]-5 triazine-1,2,4 dicarboxylate-3,6 dedimethyle obtenu et [benzyloxy-2 dimethoxy-3,4 phenyl]-1' propenyl-4 morpholine。Ces 2 cycloadditions Sont etudiees sur une serie de composes