作者:Christoph Benisch、Sabine Bethke、Rolf Gleiter、Thomas Oeser、Hans Pritzkow、Frank Rominger
DOI:10.1002/1099-0690(200007)2000:13<2479::aid-ejoc2479>3.0.co;2-9
日期:2000.7
The four-component cyclization of dilithium acetylide with dithiocyanatoalkanes yielded the hitherto unknown tetrathiacyclodiynes 34, 38, 41, and 43 in moderate yields. The use of the trimethylsilyl protecting group allowed a more efficient and flexible stepwise approach with good yields. The resulting tetrathiacyclodiynes 25−44 were investigated by X-ray analysis. For ring systems with a twist-chair
与dithiocyanatoalkanes二锂乙炔化物的四种成分的环化,得到迄今未知的tetrathiacyclodiynes 34,38,41,和43在中等产率。三甲基甲硅烷基保护基的使用允许具有良好收率的更有效和灵活的逐步方法。将所得tetrathiacyclodiynes 25 - 44通过X射线分析调查。用于与拧椅式构象的环系统中的CH的扭转角2 -Sσ-键的CH的2 -S-C≡C-S-CH 2部分采用75°和110之间的值°。这些值是由电子效应引起的,如HF / 6-31G *计算所示。