A series of Se-aryl carboselenothioates 3 (RCSSeAr, R=alkyl, aryl) were synthesized and characterized from the reaction of bis(thioacyl) sulfides 1 with sodium areneselenolates. The thionselenolesters 3 are stable (liquid or crystals) both thermally and to moisture. Reactions of 3 with aliphatic primary and secondary amines gave the corresponding ammonium carbodithioates 8 together with diphenyl diselenide
Bis(thioacyl) sulfides are prepared in 60-90% yield in a one pot reaction of piperidinium or alkali metal dithiocarboxylates with 2-chloro-1-methylpyridinium iodide at room temperature.
Zur Tautomerie vonO-Acyl- undO-Alkylidenpropandinitril-Gruppen in Trihalotropolonen und Dithiotropolonen
作者:Klaus Hartke、Michaela Sauerbier
DOI:10.1002/ardp.19923250806
日期:——
Thallium(I)‐trihalotropolonate 4bilden mit Benzoylchlorid (5) die O‐Benzoyl‐trihalotropolone 6und mit Chlorbenzylidenpropandinitril (7) die O‐Benzylidenpropandinitril‐trihalotropolone 8. Beide zeigen eine schnelle Wanderung der O‐Substituenten zwischen den Sauerstoffatomen, für die sehr ähnliche ΔG#‐ und k25‐Werte aus NMR‐Messungen ermittelt wurden. Natriumdithiotropolonat (10) läßt sich zu den thermolabilen
Synthesis of the Kinase Inhibitors Nintedanib, Hesperadin, and Their Analogues Using the Eschenmoser Coupling Reaction
作者:Lukáš Marek、Jiří Váňa、Jan Svoboda、Jiří Hanusek
DOI:10.1021/acs.joc.1c01269
日期:2021.8.6
used for the synthesis of eight kinase inhibitors including Nintedanib and Hesperadin in yields exceeding 76%. Starting compounds for the synthesis are also easily available in good yields. 3-Bromooxindoles were prepared either from corresponding isatins using a three-step synthesis in an average overall yield of 65% or by direct bromination of oxindoles (yield of 65–86%). Starting N-(4-piperidin-
Production of an alkenoyl isocyanate of the formula:
wherein R is a hydrogen atom or a lower alkyl group by reacting an acrylamide of the formula:
wherein R is as defined above with an oxalyl halide of the formula:
wherein X is a halogen atom to give a reaction mixture comprising a haloalkanoyl isocyanate of the formula:
wherein R and X are each as defined above with or without the alkenoyl isocyanate, recovering the haloalkanoyl isocyanate and, when present, the alkenoyl isocyanate separately from the reaction mixture and reacting the recovered haloalkanoyl isocyanate with a hydrogen halide-eliminating agentto give the alkenoyl isocyanate.
将式: 其中 R 如上所定义的丙烯酰胺与式: 其中 X 为卤素原子的草酰氯反应,得到包含式: 其中 R 和 X 各如上所定义的卤代烷酰异氰酸酯的反应混合物,再从反应混合物中分别回收卤代烷酰异氰酸酯和(如有)烯酰异氰酸酯,并将回收的卤代烷酰异氰酸酯与氢卤消除剂反应,得到烯酰异氰酸酯,从而制得式: 其中 R 为氢原子或低级烷基的烯酰异氰酸酯。