Ring-Expansion of Bridgehead Aldehydes with 1-Adamantanecarbonyl Cation or Benzoyl Trifluoromethanesulfonate: A New Route to Bicyclic and Tricyclic 1,2-Diols
Synthesis of (R)- and (S)-acetoin (3-hydroxybutan-2-one)
作者:David H. G. Crout、Stephen M. Morrey
DOI:10.1039/p19830002435
日期:——
Two synthetic routes to the enantiomers of acetoin (2) of high optical purity have been devised. One starting from (S)-3-methylbut-3-en-2-ol (9) led to (S)-(+)-acetoin (13). The other, starting from (2R,3R)-butane-2,3-diol gave (R)-(–)-acetoin (16).
Heterogeneous reactions with zinc. II. General synthesis of ketones from 1,2-trisubstituted glycol monoesters and the mechanism of the serini reaction
作者:Eugene Ghera
DOI:10.1021/jo00828a025
日期:1970.3
CROUT, D. H. G.;MORREY, S. M., J. CHEM. SOC. PERKIN TRANS., 1983, N 10, 2435-2440
作者:CROUT, D. H. G.、MORREY, S. M.
DOI:——
日期:——
Ring-Expansion of Bridgehead Aldehydes with 1-Adamantanecarbonyl Cation or Benzoyl Trifluoromethanesulfonate: A New Route to Bicyclic and Tricyclic 1,2-Diols
Acylation of bridgehead aldehydes with 1-adamantanecarbonyl cation generated from 1-adamantyl cation and carbon monoxide, or with benzoyl trifluoromethanesulfonate, in the presence of trifluoromethanesulfonic acid causes ring-expansion of the aldehydes by one carbon atom. Work-up of the reaction mixture with water affords a bridgehead alcohol containing the acyloxyl group on the vicinal carbon, which on saponification gives a vicinal glycol in good overall yields. For example, bicyclo[2.2.1]heptane-1-carbaldehyde gives bicyclo[2.2.2]octane-1,2-diol which is not easily accessible by the other methods.