[Thurdpong]

Lewis Acid Promoted Allylation of Amide 19a−c

i don't understand table 1. Why 20a-c are major , The difference between allytributylstannane and allytrimethylsilane.

please  propose mechanism.

thanks very much

Mod edit: Thread title indicative of content added. Dan

[clarkstill]

What are your thoughts? You need to at least show some attempt to answer the question yourself.  I would examine carefully the nature of the interaction with the lewis acid catalyst, and the various stereochemical preferences at each stage in the multi-step reaction which lead to the major diastereoisomer being the one given.

[Dan]

What paper is this from - please post the citation.

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[Thurdpong]

sorry , I didn't read a list of the Forum Rules.  This is source
http://pubs.acs.org/doi/full/10.1021/jo502238r#showFigures