Studies in polypropionate synthesis: High π-face selectivity in syn and anti aldol reactions of chiral boron enolates of lactate-derived ketones
摘要:
Use of (c)Hex(2)BCl/Me(2)NEt in the aldol reactions of the alpha'-benzoyloxy ketone 7 with aldehydes leads to high stereoselectivity (97-99.5% ds) for the crystalline anti adducts 11. Under similar conditions, the corresponding benzyl ether 6 favours formation of the syn adducts 9.