Diastereoselective additions of allenylstannanes to aldehydes
摘要:
The allenylstannane 4 undergoes highly syn selective additions to alpha-branched aldehydes 8b and 8c in the presence of BF3.OEt2. With the beta-alkoxy aldehyde 21, Cram-Felkin addition results with BF3.Oet2 as the Lewis acid, whereas MgBr2 leads to chelation-controlled addition.
Diastereoselective additions of allenylstannanes to aldehydes
摘要:
The allenylstannane 4 undergoes highly syn selective additions to alpha-branched aldehydes 8b and 8c in the presence of BF3.OEt2. With the beta-alkoxy aldehyde 21, Cram-Felkin addition results with BF3.Oet2 as the Lewis acid, whereas MgBr2 leads to chelation-controlled addition.