π-Excess σ2P=C–N–Heterocycles: Catalytic P-Arylation and Alkylation of N-Alkyl-1,3-benzazaphospholes and Isolation of P,N-Disubstituted Dihydrobenzazaphosphole P-Oxides
π-Excess σ2P=C–N–Heterocycles: Catalytic P-Arylation and Alkylation of N-Alkyl-1,3-benzazaphospholes and Isolation of P,N-Disubstituted Dihydrobenzazaphosphole P-Oxides
复制标题
π-过量 σ2P=C–N– 杂环:N-烷基-1,3-苯并磷杂环磷的催化 P-芳基化和烷基化以及 P,N-二取代二氢苯并磷杂磷 P-氧化物的分离
DOI:
--
复制
发表时间:
2015
期刊:
影响因子:
--
通讯作者:
J. Heinicke
中科院分区:
文献类型:
--
作者:
B. Niaz;B. Aluri;P. Jones;J. Heinicke
2-Unsubstituted N-alkyl-1,3-benzazaphospholes, diagonally P–C related to 2,3-unsubstituted indoles, were successfully arylated by aryl iodides and bromides or alkylated by neopentyl iodide by heating in DMF in the presence of a catalytic amount of PdCl2 or H2PtCl6 and a suitable base. In contrast to the known 2-arylations of indoles under these conditions, the reactions led to arylation in the 3-position and proceeded via highly moisture-sensitive intermediates to P-substituted 1,3-benzazaphosphole P-oxides. Thus, we present a novel route for the direct P-substitution of aromatic σ2P-heterocycles with electrophilic aryl/alkyl halides. Characteristic NMR spectroscopic data of the intermediates are consistent with –P(aryl)–C(Br/Cl)–N– species formed by metal-mediated addition of the aryl halides at the P=C bond rather than by oxidative addition to ylidic intermediates. Benzazaphospholium salts, accessible by using triethyloxonium tetrafluoroborate at room temperature and also very sensitive to hydrolysis, display distinct NMR spectroscopic data. The structures of the products were elucidated by conclusive NMR spectroscopy and HRMS data and crystal-structure analysis. Minor amounts of a bis(arylation) product could likewise be identified by crystal-structure analysis.
登录
查看更多内容
影响因子:
16.6
作者:
Chen, Xiao;Engle, Keary M.;Wang, Dong-Hui;Yu, Jin-Quan
通讯作者:
Yu, Jin-Quan
影响因子:
2.8
作者:
Ghalib, Mohammed;Jones, Peter G.;Heinicke, Joachim W.
通讯作者:
Heinicke, Joachim W.
影响因子:
4.6
作者:
M. Ghalib;P. G. Jones;C. Schulzke;D. Sziebert;L. Nyulászi;J. W. Heinicke
通讯作者:
J. W. Heinicke
影响因子:
18.3
作者:
Fu, Gregory C.
通讯作者:
Fu, Gregory C.
影响因子:
2.3
作者:
Teuma,Emmanuelle;Lyon-Saunier,Céline;Gornitzka,Heinz;Mignani,Gérard;Baceiredo,Antoine;Bertrand,Guy
通讯作者:
Bertrand,Guy