The introduction of nitrile-groups into heterocycles and conversion of carboxylic groups into their corresponding nitriles with chlorosulfonylisocyanate and triethylamine
作者:Helmut Vorbrüggen、Konrad Krolikiewicz
DOI:10.1016/s0040-4020(01)89685-x
日期:——
Addition of chlorosulfonylisocyanate (CSI) to heterocycles such as thiophene (4) or indole (15) and unsaturated systems such as dihydropyran (7) gives N-chlorosulfonylamides RCONHSO2Cl, which can be converted by equivalent amounts of triethylamine to their corresponding nitriles. Since carboxylic acids react with CSI to N-chlorosulfonylamides, subsequent treatment with triethylamine affords the corresponding
Sulfamate and its derivatives have a range of biological activities. One‐pot cyclocondensation of alkenes (1a–i) with chlorosulfonyl isocyanate generates β‐lactams. β‐Amino acidderivatives (2a–i) from β‐lactams were synthesized. Then, these highly reactive compounds were opened with MeOH to produce the corresponding sulfamate derivatives in good yields. The inhibitory effects of the novel sulfamate
氨基磺酸及其衍生物具有一系列生物活性。烯烃(1a-i)与氯磺酰基异氰酸酯的一锅环缩合反应生成β-内酰胺。从β-内酰胺合成了β-氨基酸衍生物(2a-i)。然后,这些高活性化合物用甲醇打开,以良好的收率产生相应的氨基磺酸酯衍生物。测试了新型氨基磺酸酯衍生物对人碳酸酐酶 I 和 II 同工酶(hCA I 和 hCA II)、乙酰胆碱酯酶(AChE)、丁酰胆碱酯酶(BChE)和α-糖苷酶(α-Gly)的抑制作用。新型氨基磺酸酯衍生物对 hCA I 的 Ki 值范围为 23.81-42.97 nM,对 hCA II 为 8.95-52.23 nM,对 AChE 为 8.10-45.51 nM,对 BChE 为 23.16-81.84 nM,对 BChE 为 14.6-82-4。因此,新的氨基磺酸酯衍生物对这两种同工酶都具有有效的抑制作用。总体而言,由于新型氨基磺酸酯衍生物对测试代谢酶的抑制作用,它们
Reactivity of β-Lactamido <i>N</i>-Sulfonyl Radicals
[reaction: see text] A new class of N-substituted radical has been studied. Obtained from the corresponding chlorides, beta-lactamido N-sulfonyl radicals were allylated and added onto electron-richolefins. It has been shown that the radicals do not undergo desulfonylation and are electrophilic in nature.