Arylthio-Metal Exchange of α-Arylthioalkanenitriles
摘要:
The addition of BuLi, Bu3MgLi, Et2ZnBuLi, or Me2CuLi to alpha-arylthioalkanenitriles triggers an arylthio-metal exchange. NMR spectroscopic analyses implicate organometallic attack on sulfur forming a three-coordinate sulfidate as the key intermediate. Electrophilic trapping affords tertiary and quaternary nitriles in high yield. The method addresses the challenge of improving the functional group tolerance and preventing polyalkylations.
Organometallic Lewis Acids, Part LXII. Chiral Carbonyl-Cyclopentadienyl-Triphenylphosphine-Iron and -Ruthenium Complexes with Tertiary Nitriles [Cp<i>M</i>(CO)(PPh<sub>3</sub>)(N≡C-C<i>R</i><sup>1</sup><i>R</i><sup>2</sup><i>R</i><sup>3</sup>)]<sup>+</sup>BF<sub>4</sub><sup>-</sup>(<i>M</i>= Fe, Ru)
作者:Christopher U. Missling、Karlheinz Sünkel、Heinz Langhals、Wolfgang Beck
DOI:10.1002/zaac.201700235
日期:2017.11.2
acetonitrile, primary and secondary nitriles, using alkylbromides and sodium amide in liquidammonia. By reaction of the in situ formed organometallic Lewis acids [CpM(CO)(PPh3)](+) (M = Fe, Ru) with the novel tertiary nitriles, the complexes [CpM(CO)(PPh3)(NC C-(CRRR3)-R-1-R-2]BF4 were obtained. A di-iron complex was formed with 1,6-dicyanohexane.
organolithiums, Grignardreagents, or zincates to sulfinylnitriles triggers a facile sulfinyl–metal exchange to afford N‐ or C‐metalated nitriles. Sulfinyl–magnesium exchange–alkylations efficiently install quaternary and tertiary centers, even in the case of tertiary sulfinylnitriles that contain a highly acidic methine proton. α‐Sulfinylalkenenitriles afford moderately nucleophilic magnesiated nitriles, and