Titanium and Boron Mediated Aldol Reactions of .beta.-Hydroxy Ketones
摘要:
The reaction of enolates derived from titanium and boron complexes of beta-hydroxy ketones with aldehydes afforded aldol products in good to excellent yields. Whereas the boron mediated reactions gave exclusively anti aldol products derived from the reaction at C-alpha, the titanium mediated reactions produced primarily syn aldol products from reaction at C-alpha. The product selectivities observed in the titanium mediated aldol reactions were highly dependent on the substitution pattern of the starting beta-hydroxy ketone.