Yadav, J. S. ; Reddy, B. V. S. ; Narsimhaswamy, D. ; Narsimulu, K. ; Kunwar, A. C. (2003) LiClO4- or LiOTf-accelerated 1,3-dipolar cycloaddition reactions: a facile synthesis of cis-fused chromano[4,3-c]isoxazoles Tetrahedron Letters, 44 (18). pp. 3697-3700. ISSN 0040-4039
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Official URL: http://www.sciencedirect.com/science/article/pii/S...
Related URL: http://dx.doi.org/10.1016/S0040-4039(03)00682-8
Abstract
Acetonitrile solutions of lithium perchlorate or lithium triflate are found to accelerate considerably the intramolecular 1,3-dipolar cycloaddition reactions of nitrones derived in situ from hydroxylamines and the O-prenyl derivatives of salicylaldehydes to afford enhanced rates and improved yields of tetrahydrochromano[4,3-c]isoxazole derivatives with high diastereoselectivity. The stereochemistry of the products has been assigned by using extensive NMR studies.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| Keywords: | Lithium Salts; Nitrones; Intramolecular Cycloaddition; Chromanoisoxazoles |
| ID Code: | 58895 |
| Deposited On: | 02 Sep 2011 03:18 |
| Last Modified: | 02 Sep 2011 03:18 |
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