BF(3).OEt(2) has been illuminated by successfully demonstrating the unique but highly stereoselectivereactions of hydroxy carbonyl and dicarbonyl substrates. For example, treatment of gamma-hydroxy ketone 1c with BF(3).OEt(2)/Bu(3)SnH in CH(2)Cl(2) at -78 to -40 degrees C afforded the corresponding 1, 4-diol 2c with virtually complete diastereoselection, while use of TiCl(4) as a Lewis acid under similar
(+) and (−)-Dihydropinidine and (+)- and (−)-epidihydropinidine were synthesized from hydroxy esters 1 and 2 which had been prepared by yeast reduction of methyl (2-oxocyclohexyl)acetate. The enantiomeric excess at the C-1 positions of 1 and 2 were both determined as more than 99% ee.
Asymmetric reduction of substituted indanones and tetralones catalyzed by chiral dendrimer and its application to the synthesis of (+)-sertraline
作者:Guangyin Wang、Changwu Zheng、Gang Zhao
DOI:10.1016/j.tetasy.2006.07.010
日期:2006.8
A recoverable dendrimeric supported prolinol was used as a catalyst in the asymmetric reduction of indanones and tetralones to give separable cis and trans isomers up to 97% ee. This method was also applied in the enantio selective synthesis of the antidepressant drug (+)-sertraline. (c) 2006 Elsevier Ltd. All rights reserved.
Jones,J.B.; Goodbrand,H.B., Canadian Journal of Chemistry, 1977, vol. 55, p. 2685 - 2691
作者:Jones,J.B.、Goodbrand,H.B.
DOI:——
日期:——
MARINO, J. P.;PEREZ, A. D., J. AMER. CHEM. SOC., 1984, 106, N 24, 7643-7644