(3R)-3-Aminopiperidine, 3-BOC protected → (R)-tert-butyl 1-(4-(2-chloro-5-fluorobenzyl)-6-methyl-5-oxo-4,5-dihydro-1,2,4-triazin-3-yl)piperidin-3-ylcarbamate

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The mixture of 4-(2-chloro-5-fluorobenzyl)-6-methyl-3-(methylthio)-1,2,4-triazin-5(4H)-one (30, 1.50 g, 5.0 mmol) and (R)-tert-butyl piperidin-3-ylcarbamate (1.500 g, 7.50 mmol) was ground for 5 min and then heated in a tube under nitrogen atmosphere at 130° C. for 14 h. The mixture was separated by silica gel column, and eluted with 10-50% ethyl acetate in petroleum ether to give (R)-tert-butyl 1-(4-(2-chloro-5-fluorobenzyl)-6-methyl-5-oxo-4,5-dihydro-1,2,4-triazin-3-ylpiperidin-3-ylcarbamate (31). MS: m/z, 396 (100%, M-56), 398 (35%), 452 (100%, M+1), 454 (35%), 474 (70%, M+23), 476 (25%).

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