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.
A series of chiral cyclosulfamides and oxazolidinon-2-ones have been synthesized starting from aminoacids. Regioselective substitution of these pseudopyrimidic heterocyles was carried out under Mitsunobu conditions. Best substitution results were obtained by preliminary deprotection of cyclosulfamides and their condensation with β -D-ribofuranose. Chiral oxazolidin-2-ones were coupled directly with
Synthesis of New Pseudonucleosides Containing Chiral<i>Cyclosulfamides</i>as Agycone
作者:Malika Berredjem、Nour-Eddine Aouf
DOI:10.1081/ncn-120022608
日期:2003.10
A series of chiral cyclosulfamides have been synthesized in four steps, starting from N-benzoylaminoacids. Regioselective glycosylation of these pseudopyrimidic heterocycles was carried out after deprotection. Best glycosylation results were obtained by preliminary silylation of cyclosulfamides, and their condensation with a tetraacetylribofuranose and pentaacetylglucopyranose is described, which yielded