[2 + 3] Cycloadditions of Enantiomerically Pure Oxazoline N-Oxides: An Alternative to the Asymmetric Aldol Condensation
摘要:
A series of camphor-derived oxazoline N-oxides were obtained by condensation of the appropriate orthoesters with (+)-3-(hydroxyamino)borneol (8). These unstable dipoles were used without isolation in various [2 + 3] asymmetric cyclocondensations. The regio- and diastereoselectivities of these reactions were good to excellent. After functional group transformations, adducts were cleaved by a two--step sequence (i.e., oxidation followed by acidic hydrolysis) giving beta-hydroxy ketones and (+)-3-(hydroxyimino)borneol (19). Asymmetric synthesis of (+)-1,7-dioxaspiro[5.5]-undecan-4-ol, a pheromone of Dacus oleae, was achieved as an application of this new method.
[2 + 3] Cycloadditions of Enantiomerically Pure Oxazoline N-Oxides: An Alternative to the Asymmetric Aldol Condensation
摘要:
A series of camphor-derived oxazoline N-oxides were obtained by condensation of the appropriate orthoesters with (+)-3-(hydroxyamino)borneol (8). These unstable dipoles were used without isolation in various [2 + 3] asymmetric cyclocondensations. The regio- and diastereoselectivities of these reactions were good to excellent. After functional group transformations, adducts were cleaved by a two--step sequence (i.e., oxidation followed by acidic hydrolysis) giving beta-hydroxy ketones and (+)-3-(hydroxyimino)borneol (19). Asymmetric synthesis of (+)-1,7-dioxaspiro[5.5]-undecan-4-ol, a pheromone of Dacus oleae, was achieved as an application of this new method.
Stereocontrol in the intramolecular Diels-Alder reaction. 7. Use of the trimethylsilyl group as a removable stereocontrol element to provide greatly enhanced levels of diastereoselection
作者:Robert K. Boeckman、Thomas E. Barta
DOI:10.1021/jo00218a040
日期:1985.9
BOECKMAN, R. K. ,, JR.;BARTA, T. E., J. ORG. CHEM., 1985, 50, N 18, 3421-3423