Reduction of a series of beta-hydroxyketones by SmI2/H2O/Et3N provided 1,3-diols in quantitative yields. The reactions were exceedingly clean with no byproduct formation, negating the need for further purification. Most reactions provided moderate to excellent diastereoselectivity with syn-diols as the major isomer in most instances.
Experimental Evidence for Chair-Like Transition States in Aldol Reactions of Methyl Ketone Lithium Enolates: Stereoselective Synthesis and Utilization of a Deuterium-Labeled Enolate as a Probe of Reaction Stereochemistry
作者:Christopher M. Liu、William J. Smith、Darin J. Gustin、William R. Roush
DOI:10.1021/ja050730c
日期:2005.4.1
Aldol reactions of methyl ketone lithiumenolates proceed via chairlike Zimmerman-Traxler transition states with 7:1 to 50:1 preference over alternative, boatlike transition structures, as determined by studies involving the configurationally stable deuterium-labeled enol silane 18 as the lithiumenolate precursor.
Chiral organosilicon compounds in asymmetric synthesis of chiral 1,3-diols
作者:T. H. Chan、K. T. Nwe
DOI:10.1021/jo00049a012
日期:1992.11
Chiral 1,3-diols can be prepared in high enantiomeric purity (>99% ee) from the reactions of the chiral silylcarbanion 2 with epoxides followed by oxidative cleavage of the carbon-silicon bond with hydrogen peroxide. The absolute configurations of some of the chiral 1,3-diols were determined by circular dichroism (CD).