DFT and experimental studies on Rh(III)-catalyzed dual directing-groups-assisted [3+2] annulation and ring-opening of N‑aryloxyacetamides with 1-(phenylethynyl)cycloalkanol
tanol underrhodium (III) catalysis. The impact of substrates with different ring numbers on the reaction mechanism has been discussed in detail. When the ring number exceeds 4, 1-(phenylethynyl)cycloalkanol simply conducts [3+2] annulation like the general reaction between N-aryloxyacetamides and alkyne. When the ring number is equal to 4, 1-(phenylethynyl)cyclobutanol undergoes cascade [3+2] annulation
Dialkylamino-2,4-dihydroxybenzoic Acids as Easily Synthesized Analogues of Platensimycin and Platencin with Comparable Antibacterial Properties
作者:Jingxin Wang、Herman O. Sintim
DOI:10.1002/chem.201002410
日期:2011.3.14
Function matters more than synthesis: Simple analogues of platensimycin, nanomolar inhibitors of bacterial FabF enzymes, are made in just two‐flask reactions from commercially available aldehydes. These readily synthesizedanalogues are as effective as platensimycin in killing several bacterial strains.
dual-catalyzed cyanoalkylation reaction of enamides is illustrated. A wide scope of enamides and cycloketone oxime esters was well-tolerated, affording the synthetically versatile and geometrically defined β-cyanoalkylated enamide scaffolds. The synthetic practicality of this protocol was revealed by gram-scale reactions, further transformations of enamides, and late-stage modifications of biologically
serve as a cooperative reductant to transform ketones via carbocations that undergo β-H elimination much faster than hydride transfer from silane to produce alkenes with high selectivity. Alternatively, the presence of indoles would incept the protonated ketones to generate carbocations, allowing access to Csp2–Csp3 bondformation with high reactivity and selectivity in “one pot”.