Metal-assisted fragmentation of N-aryl- and -alkyl-N-trimethyl-silylaminosulfur chlorides and N-aryl- and -alkyl-aminosulfur chlorides in the presence of conjugated dienes: synthesis and reactivity of 2-substituted-3,6-dihydro-1,2-thiazines
作者:Martin R. Bryce、Antony Chesney、Graham N. McKelvey、Andrei S. Batsanov、Judith A. K. Howard、Martin Anderson
DOI:10.1039/p19960001825
日期:——
N-Alkyl- and -aryl-N-trimethylsilylaminosulfur chlorides 2 and N-aryl- and -alkyl-aminosulfur chlorides 8 fragment in the presence of silver ions and a conjugated diene to yield 2-substituted-3,6-dihydro-1,2-thiazines 6 as the major products, possibly via transient metal-coordinated thionitroso species. By judicious choice of the substituent on the nitrogen atom, the 1,2-thiazines 6 can be stabilised by an intramolecular non-bonded oxygen ⋯ sulfur or sulfur ⋯ sulfur interaction, e.g. structures 9 and 6j. Reactions of 1,2-thiazine derivatives 6g and 6i with butyllithium, followed by addition of methyl iodide, afforded the ring-opened products 21g and 21i, respectively. Reaction of transient pentacarbonyl-(tetrahydrofuran)chromium with compound 6b afforded the pentacarbonylchromium derivative 22 which was characterised by X-ray crystallography.
N-烷基和 -芳基-N-三甲基硅氨基硫氯化物 2 以及 N-芳基和 -烷基氨基硫氯化物 8 在银离子和共轭二烯的存在下发生分解,主要生成 2-取代-3,6-二氢-1,2-噻嗪 6,可能是通过短暂的金属配位噻唑亚硫酸酯物种。通过精心选择氮原子上的取代基,1,2-噻嗪 6 可以通过分子内非键合的氧 ⋯ 硫或硫 ⋯ 硫相互作用得到稳定,例如结构 9 和 6j。1,2-噻嗪衍生物 6g 和 6i 与丁基锂反应后,再加入碘甲烷,分别得到开环产物 21g 和 21i。短暂的五羰基-(四氢呋喃)铬与化合物 6b 反应得到五羰基铬衍生物 22,该化合物通过 X 射线晶体学进行表征。