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. Author manuscript; available in PMC: 2014 May 3.
Published in final edited form as: Angew Chem Int Ed Engl. 2013 Apr 3;52(19):5046–5051. doi: 10.1002/anie.201301018

Scheme 4.

Scheme 4

Strategies involving initial preparation and use of 2-B(pin)-substituted allylboron reagents leads to alternative product isomers or demand the identification and use of a second catalyst, in contrast to the present Cu-catalyzed approach.