convenient Pd(0)-catalyzed carboannulation with propargylic compounds for the synthesis of highlysubstituted aromatic amine derivatives in a one-pot operation was developed. In this process, a significant breakthrough in aminobenzannulation is observed. Moreover, the reaction appears to be very general and suitable for a variety of amines.
An interesting migration of the rigid structure of benzene was observed when propargylic esters were introduced to the cyclization chemistry of o-alkynyl(oxo)benzene. Various 8-oxabicyclo[3,2,1]octanederivatives with many functional groups could be synthesized from this efficient approach catalyzed by platinum. The high stereo- and regioselectivity involved in this transformation was also attractive
Silver-Catalyzed Domino Reaction of ortho-Carbonylated Alkynyl-Substituted Arylaldehydes with Conjugated Dienes: Stereoselective Access to Indanone-Fused Cyclohexenes
作者:Ziping Cao、Hongbo Zhu、Xin Meng、Laijin Tian、Guang Chen、Xuejun Sun、Jinmao You
DOI:10.1021/acs.joc.6b02529
日期:2016.12.16
A silver-catalyzed domino reaction of ortho-carbonylated alkynyl-substituted arylaldehydes with conjugated dienes is described here. Through this reaction, the synthesis of a variety of indanone-fused cyclohexene derivatives can be achieved efficiently. The formation of these tricyclic products could involve a key Diels–Alder reaction of in situ generated indanenone dienophiles with conjugated dienes
Activation of <i>o</i>-Propargyl Alcohol Benzaldehydes under Acetalization Conditions for Intramolecular Electrophile Intercepted Meyer–Schuster Rearrangement
intercepted Meyer–Schuster (M–S) rearrangement under acetalization conditions using trimethyl orthoformate (TMOF). The in situ formed acetal transfers the methoxy group intramolecularly to generate the M–S intermediate in even less reactive substrates, and the formed oxocarbenium ion makes the carbonyl more electrophilic for an effective intramolecular trapping of the M–S intermediate to furnish the indanone
An Unexpected Addition of Acetic Acid to<i>ortho</i>-Electron- Deficient Alkynyl-Substituted Aryl Aldehydes Catalyzed by Palladium(II) Acetate
作者:Jianbo Zhang、Xiuling Han
DOI:10.1002/adsc.201301170
日期:2014.8.11
AbstractAn unexpected addition of acetic acid to ortho‐electron‐deficient alkynyl‐substituted aryl aldehydes catalyzed by palladium(II) acetate was achieved, which provided a convenient method for the synthesis of dihydroisobenzofurans in moderate to good yields. The electron‐withdrawing groups attached to alkynes may play an important role for the cyclization.magnified image