Dual Stereoselectivity in the Dialkylzinc Reaction Using (−)-β-Pinene Derived Amino Alcohol Chiral Auxiliaries
作者:Caitlin M. Binder、April Bautista、Marek Zaidlewicz、Marek P. Krzemiński、Allen Oliver、Bakthan Singaram
DOI:10.1021/jo802371z
日期:2009.3.20
morpholino group through a simple substitution reaction. 3-MAP was characterized by X-ray crystallography, which displayed the rigidity of the pinane framework. Amino alcohol 2-MAP was prepared from its trans isomer 2, which in turn was synthesized via hydroboration/oxidation of the morpholine enamine of (+)-nopinone. Two-dimensional NMR was used to characterize amino alcohol 2-MAP, and NOE was used to confirm
Boranes in synthesis — VII. Synthesis of 2-dialkylamino-6,6-dimethylbicyclo[3.1.1]heptan-3-ols from (R)-(+)-nopinone. Chiral auxiliaries for the addition of diethylzinc to aromatic aldehydes
作者:Christian T. Goralski、William Chrisman、Dennis L. Hasha、Lawrence W. Nicholson、Philip R. Rudolf、Donald Zakett、Bakthan Singaram
DOI:10.1016/s0957-4166(97)00566-1
日期:1997.12
The reaction of (1R,5S)-(+)-nopinone with secondary amines in cyclohexane with the azeoptropic removal of water afforded excellent yields of the correspondin enamines. Hydroboration of these enamines with BMS followed by methanolysis and oxidation with basic hydrogen peroxide gave the corresponding (1R,2S,3S,5R)-2-dialkylamino-6,6-dimethylbicyclo[3.1.1]heptan-3-ols. These amino alcohols, in spite of