Efficient synthesis of chiral C2-symmetric diamines via allylboration of bis-N,N′-metallodiimines
作者:P. Veeraraghavan Ramachandran、Debanjan Biswas、Marek P. Krzeminski、Guang-Ming Chen
DOI:10.1016/j.tetlet.2009.11.013
日期:2010.1
enantioselective synthesis of C2-symmetric bis-homoallylic aromatic and heteroaromatic diamines in 54–89% yields, in 73–94% de and ⩾98% ee has been achieved via the allylboration of the corresponding N,N′-bis(trimethylsilyl)dialdimines and N,N′-bis(diisobutylalumino)dialdimines with B-allyldiisopinocampheylborane in the presence of methanol, followed by alkaline hydrogen peroxide workup. One-pot synthesis of stable
通过相应的N,N'-双(三甲基甲硅烷基)的烯丙基硼化反应,可以实现C 2对称的双对称双均芳族和杂芳族二胺的对映选择性合成,产率分别为54-89%,de和⩾98%ee。乙二胺和N,N′-双(二异丁基铝)二乙胺与B-烯丙基二异丙基樟脑硼烷在甲醇的存在下进行碱性过氧化氢后处理。还描述了一锅合成稳定的N,N'-双(苯扎二胺-三乙基硼烷)配合物,然后进行烯丙基硼化得到苯二胺。