A convenient synthesis of 5-substituted-4-hydroxy-3,4,5,6-tetrahydro-2H-pyran-2-ones via a chemoselective differentiation of the two ester functions of dimethyl acetonedicarboxylate
โ Scribed by John D. Prugh; Albert A. Deana
- Publisher
- Elsevier Science
- Year
- 1988
- Tongue
- French
- Weight
- 191 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0040-4039
No coin nor oath required. For personal study only.
๐ SIMILAR VOLUMES
A Convenient Synthesis of 2-Amino-5,6,7,8-tetrahydro-5-oxo-
## Abstract magnified image Anhydrous zinc bromide catalysed reactions of arylidineโ3โacetyl coumarins (**1aโc**) and 5,6โbenzoanalogs of arylidine 3โacetyl coumarins (**4a,4b**) with 1,3โcyclohexanedione gives โ(4โarylโ5โoxoโ5,6,7,8โtetrahydroโ4__H__โchromenโ2yl)โ2__H__โchromenโ2โones (**3a, 3c**
A Convenient Procedure for the Synthesis of 4,6-Disubstituted 2-Oxo-2H-pyran-5-carboxylic Esters. -The Michael addition products of ฮฒ-ketoester anions of (I) with acetylenic esters (II) readily cyclize under basic reaction conditions to give 2H-pyran-2-ones (III) (8 examples). -(COVARRUBIAS-ZUNIGA,