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.
Studies in polypropionate synthesis: High π-face selectivity in syn and anti aldol reactions of chiral boron enolates of lactate-derived ketones
作者:Ian Paterson、Debra J. Wallace、Silvia M. Velázquez
DOI:10.1016/0040-4039(94)88434-x
日期:1994.11
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.
Manipulation of the aldol adducts from lactate-derived ketones. A versatile chiral auxiliary for the asymmetric synthesis of β-hydroxy carbonyl compounds
作者:Ian Paterson、Debra J. Wallace
DOI:10.1016/0040-4039(94)88435-8
日期:1994.11
The ketones 1 and 2 can be transformed into a wide range of enantiomerically-pure anti and syn α-methyl-β-hydroxy ketones and aldehydes. The α′-methyl group in 5 and 11 may be retained, demonstrating the use of the lactate-derived group as an optional chiral auxiliary.