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Lett. , Tetrahedron Lett. 38, 463–468 (1997). 4091–4094 (1997). Boger D. , Ozer R. , 10 Sim M. , J. Org. Chem. 62, Bioorg. Med. Chem. Lett. 7, 1903–1908 3230–3235 (1997). (1997). 11 Nieuwenhuijzen J. , Conti P. G. , Ot- 29 30 References 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 tenheijm H. C. , Linders J. T. , Tetrahedron Lett. 39, 7811–7814 (1998). , Cooper A. W. , Deal M. , Dean A. , Gore A. , Hawes M. , Judd D. , Merritt A. , Watson S. , Chimia 51, 832–837 (1997). I. T. Horváth, J.

Again, the excesses of all of the reagents could be removed by SPE or LPE. Liquid-phase extractions were performed with aqueous citric acid, and all of the solid-phase extractions were realized using neutral alumina [58]. Another approach using chemically tagged reagents in combination with ionexchange resin has recently been published in relation to high-throughput purification of the products of Mitsunobu reactions [59]. Masked carboxylic acid tags (t-butyl esters) were attached to both the phosphine and the azodicarboxylate.

5 11 12 1 Purification Principles in High-Speed Solution-Phase Synthesis strategy have been described [15], although few have been applied to the synthesis of combinatorial libraries. Alternatively, the fluorous tag can be attached to the product via a modified protecting group (Fig. 2). This is useful for longer reaction sequences, in which the product is purified by SPE after each step. After the last step, the fluorous tag is cleaved and separated by SPE on FSG. A perfluoro-tagged tert-butyloxycarbonyl group (FBoc) has been used for the protection of primary amino functions in the synthesis of a small amide library [29].

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Benzofuroxans, Indole Grignard Reagents, Isoindoles by Katritzky, Boulton

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