Preparation of conjugated 1,3-enynes by Rh(iii)-catalysed alkynylation of alkenes via C–H activation
作者:Karl D. Collins、Fabian Lied、Frank Glorius
DOI:10.1039/c4cc01141d
日期:——
An experimentally simple additive-free Rh(III)-catalysed direct alkynylation of alkenes has been developed. This protocol employs commercially available TIPS-EBX as the alkyne source, giving access to conjugated terminal enynes following a simple silyl-deprotection. This method has also been applied to arenes.
A palladium-catalyzedC–Hbond functionalization of acrylamides was developed to build up stereoselectively trifluoromethylated 1,3-butadienes. Using a tertiary amide as a directing group, olefins were selectively functionalized with 2-bromo-3,3,3-trifluoropropene to access these important fluorinated compounds. The methodology was extended to the construction of pentafluoroethyl-substituted 1,3-dienes
β-Alkyl-α-vinylglutaramides with threo- or erythro-configuration were synthesized stereoselectively by the Michael addition of amide dienolates to α,β-unsaturated esters.