Unexpected reactivity of oxygenated 2-acyl-1,3-dithianes with electrophiles
β Scribed by Michael Smietana; Alain Valleix; Charles Mioskowski
- Publisher
- Elsevier Science
- Year
- 2003
- Tongue
- French
- Weight
- 208 KB
- Volume
- 44
- Category
- Article
- ISSN
- 0040-4039
No coin nor oath required. For personal study only.
β¦ Synopsis
Lithium enolates of oxygenated acyl-dithiane undergo unexpected regiospecific reactions with electrophiles. Reaction of aldehydes with oxygenated acyl-dithiane leads to the formation of the corresponding monosubstituted b-hydroxy-acyl-dithiane.
π SIMILAR VOLUMES
A mild method for cleaving 1,3-diketones is described. The products are 2-acyldithianes and these R-Csynthons can be alkylated under mildly basic conditions. Acetylacetone (1) reacted with propane-1,3-dithio tosylate (2) in methanol to give 2-acetyl-1,3-dithiane + (3) (82%), whose 'H-n.m.r. spectrum
## Abstract The kinetics of the reactions of 1,2βdiazaβ1,3βdienes **1** with acceptorβsubstituted carbanions **2** have been studied at 20βΒ°C. The reactions follow a secondβorder rate law, and can be described by the linear free energy relationship logβ__k__(20βΒ°C)=__s__(__N__+__E__) [Eq.β (1)]. Wit