Thionation ofN-(?-Halogenoalkyl)-Substituted Amides withLawesson's Reagent: Facile Synthesis of 4,5-Dihydro-1,3-thiazoles and 5,6-Dihydro-4H-1,3-thiazines
作者:Yasuhiro Kodama、Mayuko Ori、Takehiko Nishio
DOI:10.1002/hlca.200590000
日期:2005.2
The thionation and cyclization of N-(ω-halogenoalkyl)-substituted amides (and related compounds) with Lawesson's reagent (LR=2,4-bis(4-methoxyphenyl)-1,3,2,4-dithiadiphosphetane 2,4-disulfide) has been investigated. Treatment of the amides 1 with LR gave the corresponding thioamides 2 in moderate to good yields (Table). The latter, upon treatment with base, afforded, either in a separate step or in
的硫化和环化Ñ( - ω -halogenoalkyl) -取代酰胺(和相关化合物)与劳森氏试剂(LR = 2,4-双(4-甲氧基苯基)-1,3,2,4-二硫2, 4-二硫化物)已被研究。用LR处理酰胺1,以中等至良好的产率得到相应的硫代酰胺2(表)。后者在用碱处理后,在单独的步骤或一锅法中得到环化的标题化合物,即4,5-二氢-1,3-噻唑3或相应的5-6-二氢-4 H-噻嗪4通过脱卤化氢反应。