Synthesis of Germacyclic Compounds by Cyclization and Annulation Reactions Utilizing <i>In Situ</i> Generated Germyl Cations
作者:Hidekazu Arii、Yaeko Iwanami、Daisuke Nakane、Hideki Masuda、Jin Matsumoto、Tsutomu Shiragami、Kunio Mochida、Takayuki Kawashima
DOI:10.1021/acs.organomet.1c00141
日期:2021.5.10
conjugation. The following reaction was conducted to demonstrate annulation between an in situ generated germyl cation and alkynes. Benzyldiphenylgermane (7) was treated sequentially with [Ph3C][B(C6F5)4], 2,6-di-tert-butyl-4-methylpyridine, and alkynes to produce 1,2-dihydro-2,2-diphenyl-2-germanaphthalene derivatives 8, together with alkynylgermane 9 in some cases. We compare the products obtained in this
胚芽阳离子是较重的第14组碳阳离子的类似物之一,已对其结构,光谱特征和对各种分子的反应性进行了广泛研究。4,4'-二-叔丁基-2- diphenylgermylbiphenyl(1)与[PH反应3 C] [B(C 6 ˚F 5)4 ]中的2,6-二甲基吡啶的存在下,以产生dibenzogermole 2良好通过弗里德尔-克来福特(Friedel-Crafts)型环化反应,可在邻近的苯环上原位生成的胚芽阳离子。该细菌-弗里德尔-克拉夫茨反应用于合成阶梯型细菌4和trigermasumanene 6。相对于芴而言,2的发射带发生了红移,这对于二苯并甲硅烷基与较重的14族元素部分与π共轭骨架之间的轨道相互作用(例如σ*-π*共轭)相关。进行以下反应以证明原位产生的胚芽阳离子和炔烃之间的环化。依次用[Ph 3 C] [B(C 6 F 5)4 ],2,6-二叔丁基-4-甲基吡啶和炔烃处理苄基二苯基锗烷(7),得到1