Macrolactonization of hydroxy acids using a polymer bound carbodiimide
โ Scribed by Gary E Keck; Carina Sanchez; Carrie A Wager
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- French
- Weight
- 64 KB
- Volume
- 41
- Category
- Article
- ISSN
- 0040-4039
No coin nor oath required. For personal study only.
โฆ Synopsis
An efficient macrolactonization procedure using a polymer bound carbodiimide is described. The procedure uses the polymer supported reagent as a replacement for dicyclohexylcarbodiimide and thus considerably simplifies the workup for such reactions. Partitioning between macrolactone and diolide is shown to depend upon the equivalents of reagent used in cases for which lactonization is difficult.
๐ SIMILAR VOLUMES
A diverse library of 2-aminobenzoxazines 3 has been synthesized using a two step approach. Addition of anthnmilie acids to isoeyanates affords ureas 2 that can be eyelized by polymer-supported EDC to give 2-aminobenzoxazines 3.
A variety of lactones were prepared in high yields at room temperature from the corresponding v-hydroxycarboxylic acids using 2-methyl-6-nitrobenzoic anhydride in the presence of 4-(dimethylamino)pyridine. A similar reaction also occurs with triethylamine when using a catalytic amount of 4-(dimethyl