palladium-catalyzed Dowd–Beckwith ringexpansion/C–C bond formation cascade is described. A range of six to nine-membered β-alkenylated cyclic ketones possessing a quaternary carbon center were accessed under mild conditions. Besides styrenes, the electron-rich alkenes such as silyl enol ethers and enamides were also compatible, providing the desired β-alkylated cyclic ketones in moderate to good yields.
First example of samarium diiodide-promoted sequential cyclization and ring-expansion reactions of α-bromomethyl cyclic β-keto esters to homologated γ-keto esters
SmI2 reductions of some aromatic as well as aliphatic alpha-bromomethyl cyclic beta-keto esters produced one-carbon homologated gamma-keto esters in modest to good yields. (C) 1998 published by Elsevier Science Ltd. All rights reserved.
Electroorganic chemistry. 124. Electroreductive intramolecular coupling of .alpha.-(.omega.-bromoalkyl) .beta.-keto esters
Reductive transformation of α,β-epoxy ketones and other compounds promoted through photoinduced electron transfer processes with 1,3-dimethyl-2-phenylbenzimidazoline (DMPBI)
Photoreactions of epoxy ketones, aromatic ketones, haloketones, and aromatic halides with 1,3-dimethyl-2-phenylbenzimidazoline (DMPBI) were studied Photoinduced single-electron transfer from DMPBI to such substrates initiates the reactions followed by radical radical rearrangement and reduction to finally give several reduced products in modest to good yields. (C) 1999 Elsevier Science Ltd. All rights reserved.
SHONO, TATSUYA;KISE, NAOKI;UEMATSU, NOBUYUKI;MORIMOTO, SHINJI;OKAZAKI, EI+, J. ORG. CHEM., 55,(1990) N7, C. 5037-5041