Synthesis of Functionalized [3], [4], [5] and [6]Dendralenes through Palladium‐Catalyzed Cross‐Couplings of Substituted Allenoates
作者:Daniel J. Lippincott、Roscoe T. H. Linstadt、Michael R. Maser、Bruce H. Lipshutz
DOI:10.1002/anie.201609636
日期:2017.1.16
A mild method for the synthesis of highly functionalized [3]–[6]dendralenes is reported, representing a general strategy to diversely substituted higher homologues of the dendralenes. The methodology utilizes allenoates bearing various substitution patterns, along with a wide range of boron and alkenyl nucleophiles that couple under palladium catalysis leading to sp‐, sp2‐, and sp3‐substituted arrays
Palladium-Catalyzed Silylation of 2,3-Allenols with Unactivated Disilanes: Access to 2-Silyl-1,3-butadienes and α-Silyl-β-hydroxy Vinylsilanes
作者:Guang-Li Xu、Zhong-Xia Wang
DOI:10.1021/acs.orglett.1c04141
日期:2022.1.21
Regioselective silylation of 2,3-allenols with disilanes was carried out under catalysis of Pd2dba3/P(o-MeOC6H4)3. In the presence of Cs2CO3, the reaction achieved 2-silyl-1,3-dienes. Reaction of 1-aryl-2,3-allenols gave the products with excellent Z/E selectivity and E-isomers as the major species. Reaction of α-alkylallenols or α-alkyl-α-aryl-allenols resulted in products with moderate Z/E selectivity
在 Pd 2 dba 3 /P( o -MeOC 6 H 4 ) 3的催化下,用乙硅烷对 2,3-丙二烯醇进行区域选择性甲硅烷基化。在Cs 2 CO 3存在下,反应得到2-甲硅烷基-1,3-二烯。1-aryl-2,3-allenols的反应得到具有优异Z / E选择性和E-异构体为主要种类的产物。α-烷基烯丙醇或 α-烷基-α-芳基烯丙醇的反应产生具有中等Z / E选择性和E-异构体也是主要的。在没有碱的情况下,该反应产生α-甲硅烷基-β-羟基乙烯基硅烷,其在用Cs 2 CO 3处理后转化为2-甲硅烷基-1,3-二烯。
Palladium‐Catalyzed Reaction of 2,3‐Allenols with Amines: Synthesis of [3]Dendralenes and 1,3‐Dienes Containing Allylic Amino and Hydroxy Groups
作者:Guang‐Li Xu、Zhong‐Xia Wang
DOI:10.1002/adsc.202200516
日期:2022.8.16
Palladium-catalyzed reaction of 2,3-allenols with amines was carried out to construct conjugated polyenes with allylic amino and hydroxy groups. [Pd(π-allyl)Cl]2/P(2-furyl)3-catalyzed reaction in MeOH led to (Z)-configurated [3]dendralene derivatives and Pd(OAc)2/P(2-furyl)3-catalyzed reaction in iPrOH resulted in (1Z,3E)-1,3-diene derivatives.
2,3-烯丙醇与胺的钯催化反应构建了具有烯丙基氨基和羟基的共轭多烯。[Pd(π-allyl)Cl] 2 /P(2-furyl) 3 -在 MeOH 中催化反应生成 ( Z )- 构型 [3]dendralene 衍生物和 Pd(OAc) 2 /P(2-furyl) 3 -在i PrOH 中的催化反应产生 (1 Z ,3 E )-1,3-二烯衍生物。
Preparation of γ,δ-Unsaturated β-Ketophosphonates from Tertiary α-Allenic Alcohols. The Synthesis of (±)-(<i>E</i>)-α-Atlantone
作者:Richard W. Friesen、Marc Blouin
DOI:10.1021/jo960894z
日期:1996.1.1
Copper-Catalyzed Reaction of 2,3-Allenols with Silylzinc Reagents: Access to 2-Silyl-1,3-butadienes