A nickel‐catalyzed alkylation of polycyclic aromatic methyl ethers as well as methyl enol ethers with B‐alkyl 9‐BBN and trialkylborane reagents that involves the cleavage of stable C(sp2)−OMe bonds is described. The transformation has a wide substrate scope and good chemoselectivity profile while proceeding under mild reaction conditions; it provides a versatile way to form C(sp2)−C(sp3) bonds that
High yielding alkylations of unactivated sp<sup>3</sup>and sp<sup>2</sup>centres with alkyl-9-BBN reagents using an NHC-based catalyst: Pd-PEPPSI-IPr
作者:Cory Valente、Sylvia Baglione、David Candito、Christopher J. O'Brien、Michael G. Organ
DOI:10.1039/b715081d
日期:——
High yielding, room temperature cross couplings of unactivated alkyl bromides and aryl bromides/chlorides with alkyl-9-BBN reagents has been achieved using an NHC-based catalyst (Pd-PEPPSI-IPr) via a general, functional-group tolerant and easily implemented protocol.
Take the direct path: Sequential nucleophilic addition of N‐methoxyamides using DIBAL and organometallic reagents provided substituted N‐methoxyamines in one pot via five‐membered chelated intermediates (see scheme, DIBAL=diisobutylaluminum hydride). The reaction allows functionalization of acyclic amides and macrolactams without a preactivation step, which is generally required for inert amide carbonyl
Synthesis of Tertiary Alkyl Amines from Terminal Alkenes: Copper-Catalyzed Amination of Alkyl Boranes
作者:Richard P. Rucker、Aaron M. Whittaker、Hester Dang、Gojko Lalic
DOI:10.1021/ja3023829
日期:2012.4.18
one-pot procedure involves hydroboration of the alkene followed by a novel electrophilic amination of the alkyl borane catalyzed by an NHC-Cu complex. Terminal alkenes are successfully transformed into tertiary alkylamines in the presence of a variety of functional groups in yields ranging from 80 to 97% with excellent regioselectivity. Results of a preliminary study of the reaction mechanism are also
Synthesis of Isomerically Pure (<i>Z</i>)-Alkenes from Terminal Alkynes and Terminal Alkenes: Silver-Catalyzed Hydroalkylation of Alkynes
作者:Mitchell T. Lee、Madison B. Goodstein、Gojko Lalic
DOI:10.1021/jacs.9b09336
日期:2019.10.30
molecules and often are used as intermediates in organic synthesis. Many alkenes exist in two stereoisomeric forms (E and Z), which have different structures and different properties. The selective formation of the two isomers is an important synthetic goal that has long inspired the development of new synthetic methods. However, the efficient synthesis of diastereopure, thermodynamically less stable, Z-alkenes