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Matched Coupling of Propargylic Carbonates with Cyclopropanols

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journal contribution
posted on 18.01.2018, 17:25 by Penglin Wu, Minqiang Jia, Weilong Lin, Shengming Ma
The ring opening–coupling reaction of cyclopropanols with propargylic carbonates affording synthetically attractive allenyl ketones has been developed. The mechanism involves the ligand-exchange reaction of in situ formed allenyl palladium methoxide with cyclopropanols followed by carbon–carbon bond cleavage and reductive elimination. The reactions proceeded smoothly under mild reaction conditions with Pd(0)/XPhos catalysis in the absence of any external base and displayed a wide scope and application to a steroidal skeleton. The efficiency of chirality transfer and synthetic utility of the allene products have also been demonstrated.