Wasserstoff: Alternative zu fossilen Energieträgern?

Stolten, Detlef

doi:10.1002/9783527646906.ch21

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2015

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“…For that reason we have repeated the reaction using 4aA in a sealed tube and added a calculated amount of air to generate a H 2 /air mixture with a ratio 79.7/20.3% (Scheme ). This ratio is above the upper explosive limit and should thus avoid a risk of explosion . The data obtained under these conditions are comparable to the data obtained using a balloon.…”

Section: Resultssupporting

confidence: 81%

Regioselective Pd-Catalyzed Synthesis of 2,3,6-Trisubstituted Pyridines from Isoxazolinones

2015

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Substituted pyridines are prevalent heterocycles of fundamental importance. Their efficient regioselective preparation is often still a challenge despite a large number of reported synthetic methodologies. In this letter we report an operationally simple approach that makes use of readily accessible isoxazolinones. The protocol involves a Pd(II)-catalyzed C-regioselective 1,4-addition to vinylketones, followed by a Pd(0)-catalyzed transformation, which is assumed to proceed via vinylnitrene-Pd intermediates. Both hydrogen and air are necessary for the pyridine formation step and could be employed at ratios above the upper explosive limit thus avoiding a safety issue. This new strategy allows an effective, scalable and practical access to various previously unknown 2,3,6-trisubstituted pyridines.

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Section: Resultssupporting

confidence: 81%