One-Pot Three-Component Synthesis of Vicinal Diamines via In Situ Aminal Formation and Carboamination
作者:Ugo Orcel、Jerome Waser
DOI:10.1002/anie.201607318
日期:2016.10.4
A synthesis of vicinal diamines via in situ aminalformation and carboamination of allyl amines is reported. Employing highly electron‐poor trifluoromethyl aldimines in their stable hemiaminal form was key to enable both a fast and complete aminalformation as well as the palladium‐catalyzed carboamination step. The conditions developed allow the introduction of a wide variety of alkynyl, vinyl, aryl
Copper-Catalyzed Alkynylboration of Alkenes with Diboron Reagents and Bromoalkynes
作者:Tian-Jun Gong、Shang-Hai Yu、Kuan Li、Wei Su、Xi Lu、Bin Xiao、Yao Fu
DOI:10.1002/asia.201701176
日期:2017.11.16
An efficient method for the synthesis of homopropargylboronates by copper‐catalyzed alkynylboration of alkenes with diboron reagents and bromoalkynes has been developed. The alkynylboration reaction features high selectivity and efficiency, mild reaction conditions, wide substrate scope, and functional‐group compatibility, and is a highly attractive complement to existing methods for the synthesis
Palladium-Catalyzed Carbo-Oxygenation of Propargylic Amines using in Situ Tether Formation
作者:Phillip D. G. Greenwood、Erwann Grenet、Jerome Waser
DOI:10.1002/chem.201900020
日期:2019.2.26
chiral auxiliaries, and catalysts. This work reports a new method for the palladium‐catalyzed oxyalkynylation and oxyarylation of propargylic amines. The reaction is perfectly regioselective based on the in situ introduction of a hemiacetal tether derived from trifluoroacetaldehyde. cis‐Selective carbo‐oxygenation was achieved for terminal alkynes, whereas internal alkynes gave trans‐carbo‐oxygenation products
Synthesis of Conjugated Boron‐Enynes
<i>via cis‐</i>
Alkynylboration of Terminal Alkynes
作者:Kuan Li、Shang‐Hai Yu、Kai‐Feng Zhuo、Xi Lu、Bin Xiao、Tian‐Jun Gong、Yao Fu
DOI:10.1002/adsc.201900294
日期:2019.9.3
A unique and practical Cu‐catalyzed cis‐alkynylboration of terminal alkynes with diboron reagents and bromoalkynes has been realized. This process enables the convenient synthesis of a large variety of trisubstituted enynylboronates under mild reaction conditions with broad functional‐groups compatibility, high regioselectivity and stereoselectivity. The usability and practicability of this process
Pd(0)-Catalyzed Alkene Oxy- and Aminoalkynylation with Aliphatic Bromoacetylenes
作者:Stefano Nicolai、Raha Sedigh-Zadeh、Jérôme Waser
DOI:10.1021/jo400254q
日期:2013.4.19
Tetrahydrofurans and pyrrolidines are among the most important heterocycles found in bioactive compounds. Cyclization-functionalization domino reactions of alcohols or amines onto olefins,constitute one of the most efficient methods to access them. In this context oxy- and aminoalkynylation are especially important reactions because of the numerous transformations possible with the triple bond of acetylenes yet these methods have been limited to the use of silyl protected acetylenes. Herein we report the first palladium-catalyzed oxy- and aminoalkynylation using aliphatic bromoalkynes which proceeded with high diastereoselectivity and functional group tolerance. A one-pot hydrogenation of the triple bond gave then access to alkyl-substituted tetrahydrofurans and pyrroldines. Finally a detailed study of the side products formed during the reaction gave a first insight into the reaction mechanism.