The synthesis, structure and properties of diazaphospholes: Reagents and ligands for asymmetric synthesis
摘要:
Reaction of C-2 diamines with PCl3 and Et3N in toluene, followed by water or hydrogen sulfide, gave a series of cyclic phosphorous acid diamides (diazaphosphole oxides) and thiophosphorous acid diamides (diazaphosphole sulfides), respectively. Similarly, reaction of diamines with phenyl dichlorophosphine gave phenyl diazaphospholes. The synthesis, properties, and structure of these diazaphospholes are reported. (C) 1998 Elsevier Science Ltd. All rights reserved.
A General and Efficient Copper Catalyst for the Amidation of Aryl Halides
作者:Artis Klapars、Xiaohua Huang、Stephen L. Buchwald
DOI:10.1021/ja0260465
日期:2002.6.1
was developed for the amidation of arylhalides by using 0.2-10 mol % of CuI, 5-20 mol % of a 1,2-diamine ligand, and K(3)PO(4), K(2)CO(3), or Cs(2)CO(3) as base. Catalyst systems based on N,N'-dimethylethylenediamine or trans-N,N'-dimethyl-1,2-cyclohexanediamine were found to be the most active even though several other 1,2-diamine ligands could be used in the easiest cases. Aryl iodides, bromides, and
Using Methanol as a Formaldehyde Surrogate for Sustainable Synthesis of
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<i>N</i>
‐Heterocycles
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via
<scp>Manganese‐Catalyzed</scp>
Dehydrogenative Cyclization
作者:Zhihui Shao、Shanshan Yuan、Yibiao Li、Qiang Liu
DOI:10.1002/cjoc.202100886
日期:2022.5.15
The development of an efficient and sustainable synthetic route for formaldehyde production from renewable feedstock, especially in combination with a subsequent transformation to straightforwardly construct valuable chemicals, is highly desirable. Herein, we report a novel manganese-catalyzed dehydrogenativecyclization of methanol as a formaldehyde surrogate with a variety of dinucleophiles for facile