Consecutive β,β′‐Selective C(sp
<sup>3</sup>
)−H Silylation of Tertiary Amines with Dihydrosilanes Catalyzed by B(C
<sub>6</sub>
F
<sub>5</sub>
)
<sub>3</sub>
the two‐fold C(sp3)−H silylation of various trialkylamine derivatives with dihydrosilanes, furnishing the corresponding 4‐silapiperidines in decent yields. The multi‐step reaction cascade involves amine‐to‐enamine dehydrogenation at two alkyl residues and two electrophilic silylation reactions of those enamines, one inter‐ and one intramolecular.
Copper-Mediated Oxidative Fluorination of Aryl Stannanes with Fluoride
作者:Raymond F. Gamache、Christopher Waldmann、Jennifer M. Murphy
DOI:10.1021/acs.orglett.6b02125
日期:2016.9.16
A regiospecific method for the oxidative fluorination of aryl stannanes using tetrabutylammonium triphenyldifluorosilicate (TBAT) and copper(II) triflate is described. This reaction is robust, uses readily available reagents, and proceeds via a stepwise protocol under mild conditions (60 °C, 3.2 h). Broad functional group tolerance, including arenes containing protic and nucleophilic groups, is demonstrated
N-alkyl(cycloalkyl)benzylamines, p-fluorobenzylamines, (1-phenylethyl)amines, [1-(p-fluorophenyl)ethyl]amines were synthesized by hydroamination of aldehydes and ketones with oximes.
A BEt<sub>3</sub>-Base Catalyst for Amide Reduction with Silane
herein is the development of a simple but practical catalytic system for the selective reduction of amides with hydrosilane or hydrosiloxane. Low-cost and readily available triethylborane (1.0 M in THF), in combination with a catalytic amount of an alkali metal base, was found to catalyze the reduction of all three amide classes (tertiary, secondary, and primary amides) to form amines under mild conditions
Regioselective Insertion of<i>o</i>-Carborynes into the α-CH Bond of Tertiary Amines: Synthesis of α-Carboranylated Amines
作者:Da Zhao、Jiji Zhang、Zuowei Xie
DOI:10.1002/anie.201409141
日期:2014.11.17
insertion with tertiaryamines, thus affording α‐carboranylated amines in very good regioselectivity and isolated yields. In this process, the nucleophilic addition of tertiaryamines to the multiple bond of o‐carboryne generates a zwitterionic intermediate. An intramolecular proton transfer, followed by a nucleophilic attack leads to the formation of the final product. Thus, regioselectivity is highly