Synthesis of Indole Substituted Twistenediones from a 2-Quinonyl Boronic Acid
作者:Jaime Rojas-Martín、Marcos Veguillas、María Ribagorda、M. Carmen Carreño
DOI:10.1021/ol402689b
日期:2013.11.15
Indole substituted twistane-like derivatives resulted in a reaction between 3,5-dimethyl-2-quinonyl boronic acid and 2-alkenyl indoles. Their MCPBA oxidation gave 6/6/9 caged systems. Boronic acid acts as a temporal promoter allowing a site-selective conjugate addition of the heteroaromatic system to the methyl substituted C-3 quinone carbon, giving an intermediate diene which is regioselectively trapped
Synthesis of functionalized alkyl substituted benzoquinones by Rh-catalyzed additions of boronic acids
作者:Marcos Veguillas、Jaime Rojas-Martín、María Ribagorda、M. Carmen Carreño
DOI:10.1039/c7ob00979h
日期:——
or aldehydes. The process allows rapid access to functionalized benzoquinones under very mild conditions and good yields. We disclose the first example of a Rh-catalyzed 1,4-addition reaction of benzoquinonyl boronic acid to methyl vinyl ketone and other conjugate acceptors, which allows the direct synthesis of 2-(γ-functionalized alkyl) substituted benzoquinones.
Synthesis of Benzo- and Naphthoquinonyl Boronic Acids: Exploring the Diels-Alder Reactivity
作者:Marcos Veguillas、Maria C. Redondo、Isabel García、María Ribagorda、M. Carmen Carreño
DOI:10.1002/chem.200902796
日期:2010.3.22
dehydroboronation, depending on the substitution on both the quinone and diene partners. The boronic acid acts as a temporary controller, opening a direct access to trans‐fused meta‐regiosomeric adducts when 3‐methyl‐substituted 2‐quinonyl boronic acids react with dienes with a substituent at C‐1. A particularly valuable synthetic result was obtained in the reaction between 3,6‐dimethyl‐2‐quinonyl
Regioselective Alkylation of Heteroaromatic Compounds with 3-Methyl-2-Quinonyl Boronic Acids
作者:Marcos Veguillas、María Ribagorda、M. Carmen Carreño
DOI:10.1021/ol1028964
日期:2011.2.18
heteroaromatic compounds with 3-methyl substituted 2-quinonyl boronic acids proceeded by 1,4-addition followed by spontaneous protodeboronation, leading directly to the Friedel−Crafts alkylation products instead of the commonly observed alkenylation derivatives resulting from quinones. The boronic acid acts as a temporary regiocontroller, making the system a highly reactive quinone equivalent and opening a
Control of the Regio- and Stereoselectivity in Diels-Alder Reactions with Quinone Boronic Acids
作者:María C. Redondo、Marcos Veguillas、María Ribagorda、M. Carmen Carreño
DOI:10.1002/anie.200803428
日期:2009.1.2
The dienophilic reactivity of 2‐methyl‐substituted quinones has been substantially increased by the introduction of a boronicacid substituent, which makes them equivalent to a highly reactive quinone. The Diels–Alderreactions of these quinones are followed by spontaneous and stereoselective protodeboronation to give the trans‐fused adducts. The boron group is a temporal regiocontroller and leads to