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The azole‐directed cobalt‐catalyzed asymmetric hydrogenation of alkenes has been developed with high efficiency. With this approach, chiral pyrazole compounds were obtained in quantitative yields and excellent enantioselectivities (up to 99 % ee) under mild conditions, and the hydrogenation was conducted on a gram scale with up to 2000 TON. Several useful applications were demonstrated including the...
With his hand holding the sail and his feet on the sailboard, the position of the windsurfer mimics the key strategy of this work: the activation of hydrogenated substrates by chelating coordination with cobalt. The surfer is the cobalt catalyst holding the sail to coordinate parazole, and with his foot on the hydrogenated substrate board to coordinate the vinyl group. Bubbles in the seawater represent...
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