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Jiang, Wanlong; Chen, Chen; Marinkovic, Dragan; Tran, Joe A; Chen, Caroline W; Arellano, L Melissa; White, Nicole S; Tucci, Fabio C
Journal of organic chemistry, 10/2005, Letnik: 70, Številka: 22Journal Article
reaction: see text 2-4-(tert-Butoxycarbonyl)piperazinylbenzylidene-tert-butanesulfinamides underwent nucleophilic 1,2-addition with different organometallic reagents to give highly diastereomerically enriched adducts. X-ray crystallography of the resulting alpha-branched N-Boc-2-piperazinylbenzyl-tert-butanesulfinamides confirms different mechanisms depending on the organometallic reagent used. Differential deprotection of the N-Boc and the tert-butanesulfinamides was investigated, and the dehydration byproducts have been identified and characterized. To avoid the formation of byproducts in the acidic deprotection step, the N-tert-butanesulfinamide group was converted to the corresponding N-tert-butanesulfonamide (Bus), which allowed for clean orthogonal deprotection. The efficient synthesis and deprotection of the N-Boc-2-piperazinylbenzyl-tert-butanesulfinamides herein described constitutes an attractive method for extensive structure-activity studies in the search for novel ligands of the human melanocortin 4 receptor.
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