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
Synthesis and stereochemistry of polycyclic cyclohexa-2,4-dienones
作者:Christine A. Barron、Nazir Khan、James K. Sutherland
DOI:10.1039/c39870001728
日期:——
The spontaneous cyclisation of divinyl ketenes to cyclohexadienones and the interception of the intermediate ketenes with Ph3PCHCO2Me to form allenes which cyclise to methylenecyclohexadienes has been investigated.
Acetylide additions to enediones. Regioselectivity based on stereoelectronic control
作者:Dennis Liotta、Manohar Saindane、Ustun Sunay、W. Charles L. Jamison、Judy Grossman、Preston Phillips
DOI:10.1021/jo00217a055
日期:1985.8
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
Tricyclic cyclohexa-2,4-dienones and methylenecyclohexadienes which are potentially useful for diterpenoid synthesis have been prepared by cyclisation of 1,3,5-hexatriene-i-ones and 1,2,4,6-heptatetraenes.