Cycloaddition of the allenic acid 3 with the N-cyclohexyl-N'-heteroaromatic carbodiimides 2a and 2b gave the isomeric pyrido[l,2-~]pyrimidinones 4 and 5 and thiazolo[3,2-~]pyrimidinones 6 and 7, respectively, instead of the expected Diels-Alder adducts analogous to 1. The compounds of the latter typ
Cycloaddition of Carbodiimides and Triphenylketen-imine to Allenic Acids. Preliminary Communication
✍ Scribed by Latchezar S. Trifonov; Alexander S. Orahovats
- Publisher
- John Wiley and Sons
- Year
- 1986
- Tongue
- German
- Weight
- 150 KB
- Volume
- 69
- Category
- Article
- ISSN
- 0018-019X
No coin nor oath required. For personal study only.
✦ Synopsis
Acid I b was obtained from the ethyl ester [I] after alkaline hydrolysis, m.p. 175.0-180.0" (dec.) ' ) Note Added in Proof. -In the mean-time, some further examples of this reaction type have been published: L.
📜 SIMILAR VOLUMES
## Abstract As an active diene (more active than furan itself), 3,4‐dimethoxyfuran (**1**) affords with many dienophiles the respective cycloadducts in a high yield [2]. It has recently been found that under thermal conditions **1** easily reacts with maleic anhydride and its monomethyl derivative,
## Abstract A novel route with L‐ascorbic acid as a single common starting material to asymmetric synthesis of all eight diastereomers of L‐hexoses is described. Assessment of this new approach is demonstrated by the expedient synthesis of L‐galactopyranose and L‐talopyranose derivatives. Key steps
## Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable v