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The new palladacycle catalyst 5 was synthesized, and this Pd catalyst showed high catalytic activity with turnover numbers of up to 8 900 000 (mol product per mol Pd) and turnover frequencies of up to 400 000 (mol product per mol Pd per h) in the coupling of aryl halides with olefins. This is the highest catalytic activity of all Heck reactions reported to date.
An enantioselective total synthesis of (+)-xestoquinone has been achieved using a cascade-type asymmetric Heck reaction (in up to 63% ee and 39% chemical yield (66% conversion yield)) of the aryl bromide derivative (4). The use of a larger amount of silver exchanged zeolite resulted in a decrease in ee and yield. This is the first example of an effect of the amount of a silver salt on the ee and...
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