Efficient Preparation of Terminal Conjugated Dienes by Coupling of Dienol Phosphates with Grignard Reagents under Iron Catalysis
作者:Gérard Cahiez、Vanessa Habiak、Olivier Gager
DOI:10.1021/ol800816f
日期:2008.6.1
An efficient new route to prepare stereoselectively terminal conjugated dienes by coupling Grignardreagents and dienol phosphates in the presence of Fe(acac)3 is described. The synthetic utility of this new iron-catalyzed procedure is illustrated by the synthesis of the pheromone of Diparopsis castanea according to a very expeditious strategy.
[<i>n</i>]Dendralenes as a Platform for Selective Catalysis: Ligand-Controlled Cu-Catalyzed Chemo-, Regio-, and Enantioselective Borylations
作者:Camille Desfeux、Céline Besnard、Clément Mazet
DOI:10.1021/acs.orglett.0c01892
日期:2020.11.6
We report the development of two complementary methods for the Cu-catalyzed anti-Markovnikov borylation of one specific olefin in 2-substituted [n]dendralenes (n = 3–6). The first protocol operates with a bisphosphine ligand and occurs with high regio- and chemoselectivity for the terminal double bond, independently of the number of cross-conjugated alkenes. We show that the use of a chiral phosphanamine
我们报告了在2个取代的[ n ]树枝状烯(n = 3–6)中一种特定烯烃的Cu催化的反Markovnikov硼化的两种互补方法的发展。第一种方案使用双膦配体,并且对末端双键具有高区域选择性和化学选择性,而与交叉共轭烯烃的数量无关。我们表明,使用手性膦胺配体可以使与[ n ]树枝状烯烃中的末端烯烃交叉共轭的烯烃具有高度的化学,区域和对映选择性的硼化作用。
Synthesis of conjugated dienes by nickel-catalyzed reactions of 1,3-alkadien-2-yl phosphates with grignard reagents
作者:Christer Sahlberg、Abdul Quader、Alf Claesson
DOI:10.1016/s0040-4039(00)94062-0
日期:1983.1
2-Substituted 1,3-alkadienes were prepared in good yields by reactions of diethyl 1-methylene-2-propenyl phosphate and diethyl 1-methylene-3-phenyl-2-propenyl phosphate with various Grignard reagents in the presence of nickel(II) catalysts.
Allenes and acetylenes XXVI. Organocuprate reactions of 1,3-alkadien-2-yl phosphates. a new approach to the synthesis of allenes
作者:Alf Claesson、Abdul Quader、Christer Sahlberg
DOI:10.1016/s0040-4039(00)81639-1
日期:1983.1
Allenic hydrocarbons and one γ-allenic ketone were prepared in poor to good yields by the reactions of diethyl 1-methylene-2-propenyl phosphate and diethyl 1-(1-cyclohexenyl) phosphate with various organocuprates.
The Synthesis and Reactions of Dialkyl 1-Vinylvinyl-Phosphates
作者:Frank Kienzle、Perry Rosen
DOI:10.1002/hlca.19790620208
日期:1979.3.7
3,4-Dichlorobutanone reacts with trialkyl phosphites to give dialkyl 1,3-butadien-2-yl phosphates. Their structures were determined by spectroscopic methods and various chemical reactions.