Versatilite de reactivite de l`acetylene dicarbaldehyde et des aldehydes α-acetyleniques a l'egard des dienes conjugues cycliques et heterocycliques en milieu acide
作者:A. Gorgues、A. Simon、A. Le Coq、A. Hercouet、F. Corre
DOI:10.1016/s0040-4020(01)87436-6
日期:1986.1
of acetylenedicarbaldehyde and the corresponding mono acetal is described. A comparison of their reactivity with other α-acetylenic aldehydes R-CC-CHO to towards conjugated cydic or hetero- cydic dienes is presented. Under neutral conditions, the only expected Diels-Alder adducts are formed. Under acidic conditions (HCO2H, CF3,CO2H or eventually AcOH) they afford the only Diel-Alder adduct when the
Acetylenedicarbaldehyde: isolation and some examples of exclusive dienophilicity under neutral conditions
作者:Dominique Stéphan、Alain Gorgues、Ahmed Belyasmine、André Le Coq
DOI:10.1039/c39880000263
日期:——
Acetylenedicarbaldehyde (1) is isolated in the pure state after acidolysis of its monoacetal (2) with an excess of formic acid followed by dehydration of residual HCO2H into CO with P2O5; underneutralconditions, (1) reacts with conjugated dienes as a dienophile only, in contrast to what occurs in acidic medium.
在用过量的甲酸酸解其单缩醛(2),然后用P 2 O 5将残留的HCO 2 H脱水成CO时,分离出纯的乙炔二甲醛(1); 在中性条件下,(1)与共轭二烯仅作为亲二烯体反应,这与酸性介质中的反应相反。
Bobbitt’s Salt-Mediated Oxidation of Alkynyl-ols and -diols to the Corresponding Aldehydes and Their Application in Tandem Reactions
作者:James M. Bobbitt、Nicholas A. Eddy、Christian Brückner、William F. Bailey、Nabyl Merbouh
DOI:10.1021/acs.joc.2c02828
日期:2023.3.3
4-hydroxy-2-butynal or acetylene dicarboxaldehyde, and the resulting stable dichloromethane solutions containing the chemically sensitive acetylene aldehydes were used directly in subsequent Wittig, Grignard, or Diels–Alder reactions. This method provides safe and efficient access to propynals and allows the preparation of polyfunctional acetylene compounds from readily accessible starting material without the