Catalytic Carbonyl-Olefin Metathesis of Aliphatic Ketones: Iron(III) Homo-Dimers as Lewis Acidic Superelectrophiles
作者:Haley Albright、Paul S. Riehl、Christopher C. McAtee、Jolene P. Reid、Jacob R. Ludwig、Lindsey A. Karp、Paul M. Zimmerman、Matthew S. Sigman、Corinna S. Schindler
DOI:10.1021/jacs.8b11840
日期:2019.1.30
carbon-carbon bond formation. However, currently available synthetic protocols rely exclusively on arylketone substrates while the corresponding aliphatic analogs remain elusive. We herein report the development of Lewis acid-catalyzed carbonyl-olefin ring-closing metathesis reactions for aliphatic ketones. Mechanistic investigations are consistent with a distinct mode of activation relying on the in
This invention provides novel heterocyclic derivatives, their pharmaceutical formulations, and their use for antagonizing angiotensin II receptors in mammals.
该发明提供了新颖的杂环衍生物,它们的药物配方以及它们用于拮抗哺乳动物中的血管紧张素II受体的用途。
A Versatile Synthesis of Fumaquinone
作者:Miguel Peña-López、M. Montserrat Martínez、Luis A. Sarandeses、José Pérez Sestelo
DOI:10.1021/jo100779z
日期:2010.8.6
novel prenylated naphthoquinone antibiotic, was synthetized from ethyl acetoacetate in three steps (58% overall yield). The key step of the synthesis is the construction of the naphthoquinone skeleton by a regioselective Diels−Alder reaction between a 2-alkyl 1,3-bis(trimethylsilyloxy)-1,3-diene derivative and a bromoquinone. This short and versatile approach confirms the structure of fumaquinone and
This invention provides novel heterocyclic derivatives, their pharmaceutical formulations, and their use for antagonizing angiotensin II receptors in mammals.
本发明提供了新型杂环衍生物,其药物配方以及在哺乳动物中对抗血管紧张素II受体的用途。
Functionalized five-membered rings from acyclic unsaturated β-ketoester systems
作者:Eugene E. van Tamelen、Jih Ru Hwu、Thomas M. Leiden
DOI:10.1039/c39830000062
日期:——
In Lewis acid-promoted cyclizations, both the ketoester (1) and its enol acetate (4) generate the cyclopentane (2), while the ketoester (5) under similar conditions does not form the carbobicycle (6) but is converted into the heterocycle (7), via the monocyclic ketoester (8).