Palladium-catalyzed benzylic C(sp<sup>3</sup>)–H carbonylative arylation of azaarylmethyl amines with aryl bromides
作者:Haoqiang Zhao、Bowen Hu、Lijin Xu、Patrick J. Walsh
DOI:10.1039/d1sc02078a
日期:——
highly selective palladium-catalyzed carbonylative arylation of weakly acidic benzylic C(sp3)–H bonds of azaarylmethylamines with aryl bromides under 1 atm of CO gas has been achieved. This work represents the first examples of use of such weakly acidic pronucleophiles in this class of transformations. In the presence of a NIXANTPHOS-based palladium catalyst, this one-pot cascade process allows a range
在 1 atm CO 气体下,实现了氮杂芳基甲基胺的弱酸性苄基 C(sp 3 )-H 键与芳基溴的高选择性钯催化羰基化芳基化。这项工作代表了在此类转化中使用此类弱酸性亲核试剂的第一个例子。在基于 NIXANTPHOS 的钯催化剂存在下,这种一锅级联工艺允许一系列含有吡啶基、喹啉基和嘧啶基部分的氮杂芳基甲基胺以及无环和环状胺与芳基溴和 CO 进行有效反应,生成 α-氨基芳基-氮杂芳基甲基酮的产率中等至较高,具有广泛的底物范围和良好的官能团耐受性。该反应通过苄基 C-H 键的原位可逆去质子化产生活性碳负离子,从而避免预官能化有机金属试剂和产生额外的废物。重要的是,产品的操作简单性、可扩展性和多样性凸显了该协议的潜在适用性。
One-Pot Aminoalkylation of Aldehydes: Diastereoselective Synthesis of Vicinal Diamines with Azaarylmethylamines
作者:Haixing Guan、Xianzhong Cao、Patrick J. Walsh、Jianyou Mao
DOI:10.1021/acs.orglett.9b03287
日期:2019.11.1
A one-pot synthesis of vicinaldiamines with azaarylmethylamines and aldehydes is reported. A diverse array of vicinaldiamines could be achieved in up to 92% yield with good to excellent diastereoselectivities (up to 20:1). The tandem reaction takes place under mild conditions and provides an alternative strategy for the synthesis of vicinaldiamines.
Pd(OAc)2/Nixantphos or CoI2/Nixantphos catalyzed allylicsubstitutions with weakly acidic C(sp)3–H bonds of azaarylmethylamines are described. This method facilitates access to various kinds of heteroaryl rings containing homoallylamines (39 examples, 30–98% yields) with excellent functional group tolerance and diastereoselectivity. Compared with the Pd/Nixantphos complex, the Co/Nixantphos catalysis