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tert-Butyldimethylsilyl chloride (2-BROMOETHOXY)-TERT-BUTYLDIMETHYLSILANE tert-butyl 2-(chloromethyl)-1H-benzimidazole-1-carboxylate TERT-BUTYL PROPIOLATE tert-butyl (4-bromobutyl)carbamate tert-butyl 6-bromo-2H-pyrido[3,2-b][1,4]oxazine-4(3H)-carboxylate tert-butyl 2-oxo-8-azaspiro[4.5]decane-8-carboxylate