Bifunctional chiral auxiliaries 2: the synthesis of 1,3-diacylimidazolidin-2-ones from 1,2-diamines
摘要:
The title compounds are readily prepared in three steps via the corresponding 1,3-diacylimidazolidine-2-thiones. The final step involves the novel use of mercury (II) acetate for the conversion of thioureas to ureas.
Bifunctional chiral auxiliaries 4: Alkylation of enolates derived from 1,3-diacyl-trans-4,5-tetramethyleneimidazolidin-2-ones
作者:Stephen G. Davies、Andrew A. Mortlock
DOI:10.1016/s0040-4039(00)91875-6
日期:1992.2
Addition of alkyl halides to sodium and potassium enolates of 1,3-diacyl-trans-4,5-tetramethyleneimidazolidin-2-ones allows diastereoselective alkylation of both acyl sidechains with the latter enolates showing generally higher stereoselectivities. S-(-)-3-Phenyl-2-methylpropan-1-ol 6 was prepared in this way with a 93% enantiomeric excess.