5743-85-1Relevant articles and documents
SPIRO COMPOUNDS AND PHARMACEUTICAL USE THEREOF
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Page/Page column 76, (2009/07/17)
The Spiro compound represented by the following general formula [Ia], its pharmaceutically acceptable salt or a solvate thereof
Preparation of Spirocyclic Cyclopropyl Ketones through Condensation of Epoxides with β-Keto Phosphonates
Jacks, Thomas E.,Nibbe, Heidi,Wiemer, David F.
, p. 4584 - 4588 (2007/10/02)
The β-keto phosphonate derivatives of several cyclic ketones have been shown to undergo condensation with epoxides upon treatment with base, affording spirocyclic cyclopropyl ketones.Moderate to reasonable yields were obtained under sealed tube conditions
Polyspiranes, 5. Synthesis and Reactions of Functionalized Polyspiranes with Three- to Eight-Membered Central Ring - Polycyclopropylidenes (Rotanes)
Fitjer, Lutz
, p. 1047 - 1060 (2007/10/02)
The olefins 4, 5, and 6 have been proved to be valuable intermediates in the synthesis of functionalized polyspiranes and rotanes. Rotane (2, n = 3) and its methyl carboxylate 11 may be synthesized by way of 4, the functionalized polyspiranes 19, m = 1,2, 21, m = 0,1,2 and 1, m = 0,1,2, by way of 5.The ketones 1, m = 0,1,2 may then be transformed to the corresponding rotanes 2, n = 4,5,6.The factors controlling the pronounced regioselectivity in the cycloaddition of p-nitrobenzenesulfonyl azide to 19, m = 0,1,2, are discussed, the stepwise ring enlargement of 6 to yie ld 28 and 29 as potential precursors of 2, n = 7,8, is described.