Exploring the Chemistry of<i>N,N</i>′-Diamidocarbenes with Organophosphorus Compounds
作者:Daniel T. Chase、Jonathan P. Moerdyk、Christopher W. Bielawski
DOI:10.1021/ol4035484
日期:2014.2.7
A readily available N,N′-diamidocarbene (DAC) was found to insert into the P–H bonds of primary and secondary phosphines as well as a phosphonate ester. In contrast, tertiary phosphines catalyzed the ring contraction of the DAC to an iminopyrrolidinedione. Treating the DAC with trimethyl phosphite afforded the corresponding diamidophosphonate ester and olefinic products expected from an Arbuzov-type
Diazomethane umpolung atop anthracene: an electrophilic methylene transfer reagent
作者:Maximilian Joost、Wesley J. Transue、Christopher C. Cummins
DOI:10.1039/c7sc04506a
日期:——
exhibit dangerous heat or shock sensitivity. Effective umpolung of the diazomethane unit imbues 1 with electrophilicity at the methylene carbon center. Its reactivity with nucleophiles such as H2CPPh3 and N-heterocyclic carbenes is exploited for CC bond formation with elimination of dinitrogen and anthracene. Similarly, 1 is demonstrated to deliver methylene to a nucleophilic singlet d2 transition metal
将重氮甲烷的末端氮原子正式加成到蒽的 9,10 位会产生 H 2 CN 2 A(1,A = C 14 H 10或蒽)。该腙的合成是由 Carpino 的肼 H 2 N 2 A通过多聚甲醛处理合成的。已发现化合物1是一种易于处理的固体,不会表现出危险的热或冲击敏感性。重氮甲烷单元的有效 umpolung在亚甲基碳中心赋予1亲电性。它与亲核试剂如 H 2 CPPh的反应性3和N-杂环卡宾被开发用于CC键的形成,同时消除了二氮和蒽。类似地, 1被证明可以将亚甲基传递到亲核单线态 d 2过渡金属中心 W(ODipp) 4 ( 2 ),从而产生稳定的亚甲基配合物 [ 2 CH 2 ]。这种行为与 Wittig 试剂 H 2 CPPh 3的行为形成对比,后者是一种更传统的布朗斯台德碱性亚甲基源,在暴露于2时形成亚甲基盐 [MePPh 3 ][ 2 CH]。