starting from chlorosulfonyl isocyanate (CSI), 1-substituted N-benzyl-2-chloroethylamine hydrochloride and acyl chloride. Chiral N-acyl-thiadiazolidines 1,1-dioxides have been prepared in high yield starting from the corresponding cyclosulfamides acyl chloride, triethylamine and a catalytic amount of 4-(N,N-dimethylamino)pyridine. L'accès régiospécifique aux cyclosulfamides chiraux N-acylés (analogues sulfonés
从氯磺酰基异氰酸酯 (CSI)、1-取代的 N-苄基-2-氯乙胺盐酸盐和酰氯开始,进行手性 N-酰基环磺酰胺(环脲的磺胺类似物)的区域特异性合成。从相应的环磺酰胺酰氯、三乙胺和催化量的 4-(N,N-二甲氨基)吡啶开始,已经以高产率制备了手性 N-酰基-噻二唑烷 1,1-二氧化物。L'accès régiospécifique aux cyclosulfamides chiraux N-acylés (analogues sulfonés d'urèes cycliques) Les N-酰基噻二唑烷 1,
Simple and efficient cleavage reaction of the boc group in heterocyclic compounds
作者:Klai Nadia、Berredjem Malika、Khettache Nawel、Belghit Med Yazid、Régaïnia Zine、Nour-Eddine Aouf
DOI:10.1002/jhet.5570410109
日期:2004.1
cyclosulfamides have been synthesized by alkaline cyclisation starting from N-benzoylamino acids (Ala, Val, Leu, Phe) derivatives and chlorosulfonyl isocyanate. A simplified and regioselective deprotection of the cycliccompounds (cyclosulfamides) containing the tert-butyloxycarbonyl group (Boc) has been achieved in good yield by fusion under reduced pressure.