Fast Nitroaldol Reaction Using Powdered KOH in Dry Media
作者:Roberto Ballini、Giovanna Bosica、Mauro Parrini
DOI:10.1246/cl.1999.1105
日期:1999.10
β-Nitroalkanols are easily obtained within a few minutes, through the nitroaldol (Henry) reaction, catalyzed by a stoichiometric amount of powdered potassium hydroxide, in dry media. Satisfactory to excellent yields are obtained both with primary and secondary nitrocompounds, either with aromatic or aliphatic aldehydes.
alumina is found to promote the conjugate addition of indoles to nitroalkenes in solventlessconditions at 60 °C. Nitroalkenes can be replaced by nitro alcohols that are converted into nitroolefins under the reaction conditions. Alternatively, a tandem nitroaldol-dehydration allows the utilization of nitroalkanes and aldehydes as remote precursors of reactive nitroalkenes in a ‘one–pot’ synthesis of 3-substituted
Synthesis of 2,2′-bipyrrole-5-carboxaldehydes and their application in the synthesis of B-ring functionalized prodiginines and tambjamines
作者:Papireddy Kancharla、Kevin A. Reynolds
DOI:10.1016/j.tet.2013.07.067
日期:2013.9
Facile, versatile, and cost-effective synthetic routes for the preparation of a range of new 3-alkyl-, 4-alkyl-, 3,4-dialkyl-, and 3-halo-4-alkyl-2,2′-bipyrrole-5-carboxaldehydes have been developed. These 2,2′-bipyrrole-5-carboxaldehydes offer interesting potential as building blocks for making bioactive natural and unnatural products, as demonstrated by the synthesis of B-ring functionalized prodiginines
A general synthesis of 5-unsubstitutedbenzylpyrrole-2-carboxylates was developed based on the reaction of β-nitroacetates with benzylisocyanoacetate. The advantage of this route over other pyrrole syntheses was the regiochemical control of the substitution pattern on the pyrrole ring.
Nanoporous lanthanide metal–organic frameworks as efficient heterogeneous catalysts for the Henry reaction
作者:Anirban Karmakar、Susanta Hazra、M. Fátima C. Guedes da Silva、Anup Paul、Armando J. L. Pombeiro
DOI:10.1039/c5ce01456e
日期:——
self-assembled lanthanide coordination polymers formulated as [La(L1)2]n·1n(DMF)H·3n(DMF) (1), [Ce(L1)2]n·1n(DMF)H·2n(DMF) (2), [Sm(L1)2]n·1n(HCONH2)H·2n(HCONH2) (3), [La(L2)(HL2)(H2O)(DMF)2]n (4) and [Ce(L2)(HL2)(H2O)(DMF)2]n (5) [H2L1: 2-acetamidoterephthalic acid and H2L2: 2-benzamidoterephthalic acid] has been synthesized from the reactions of H2L1 or H2L2 with different lanthanide salts under hydrothermal
一系列自组装镧系配位聚合物,配制成[La(L1)2 ] n ·1 n(DMF)H·3 n(DMF)(1),[Ce(L1)2 ] n ·1 n(DMF) H·2 n(DMF)(2),[Sm(L1)2 ] n ·1 n(HCONH 2)H·2 n(HCONH 2)(3),[La(L2)(HL2)(H 2 O )(DMF)2 ] n(4)和[Ce(L2)(HL2)(H 2 O)(DMF)2 ]n(5)[H 2 L1:2-乙酰氨基对苯二甲酸和H 2 L2:2-苯甲酰胺对苯二甲酸]是由H 2 L1或H 2 L2与不同的镧系元素盐在水热条件下反应合成的,并通过元素分析进行表征,红外光谱,X射线单晶衍射,粉末X射线衍射,热重分析和光致发光光谱。X射线衍射分析表明,骨架1-3具有类似类型的三维结构,由L1 2−配体和三核镧系元素结组成,其中存在两个晶体学上独立的镧系元素原子。框架4和5是同构的,特征在