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Pentafluorophenylammonium Trifluoromethanesulfonimide: Mild, Powerful, and Robust Catalyst for Mukaiyama Aldol and Mannich Reactions between Ketene Silyl Acetals and Ketones or Oxime Ethers

03-May-2010 | Nagase, Ryohei; Osada, Jun; Tamagaki, Hiroaki; Tanabe, Yoo, Advanced Synthesis & Catalysis, 2010

Pentafluorophenylammonium trifluoromethanesulfonimide (C6F5N+H3[sdot]NTf2-) promotes Mukaiyama aldol and Mannich reactions using ketene silyl acetals with ketones and oxime ethers, respectively. The present robust method is mild, but powerful enough to utilize less accessible electrophiles such ...


Storable and Air‐Stable Zirconium Complex‐Catalyzed Highly Enantioselective Darzens Reaction of Diazoacetamide with Aldehydes

03-May-2010 | He, Long; Liu, Wei‐Jun; Ren, Lei; Lei, Tao; Gong, Liu‐Zhu, Advanced Synthesis & Catalysis, 2010

An asymmetric Darzens reaction of aldehydes with diazo-N,N-dimethylacetamide (3) catalyzd by an air-stable and storable chiral zirconium Lewis acid catalyst, which is formed from 3,3[prime]-diiodobinaphthol and tetrabutoxyzirconium, gives solely the cis-glycidic amides in high yields with ...


(η6‐Arene)ruthenium(N‐heterocyclic carbene) Complexes for the Chelation‐Assisted Arylation and Deuteration of Arylpyridines: Catalytic Studies and Mechanistic Insights

03-May-2010 | Prades, Amparo; Poyatos, Macarena; Peris, Eduardo, Advanced Synthesis & Catalysis, 2010

A series of ([eta]6-arene)ruthenium complexes have been tested in the arylation of arylpyridines. One ([eta]6-p-cymene)ruthenium(N-heterocyclic carbene) complex (labelled as 1 in the text) was found to be the most effective, being capable of arylating a wide set of substantially different ...


Copper‐Catalyzed Three‐Component Synthesis of 2‐Iminodihydrocoumarins and 2‐Iminocoumarins

03-May-2010 | Shen, Yang; Cui, Sunliang; Wang, Jing; Chen, Xiaopeng; Lu, Ping; Wang, Yanguang, Advanced Synthesis & Catalysis, 2010

An efficient synthesis of N-sulfonyl-substituted 2-imino-3,4-dihydrocoumarins and 2-iminocoumarins via a copper-catalyzed multicomponent reaction of sulfonyl azides with terminal alkynes and [beta]-(ortho-hydroxyphenyl)-[alpha],[beta]-unsaturated ketones or ortho-hydroxyphenylpropiolates has been ...


Morpholinium Trifluoroacetate-Catalyzed Aldol Condensation of Acetone with both Aromatic and Aliphatic Aldehydes

22-Apr-2010 | Kristina Zumbansen, Arno Döhring, Benjamin List, Advanced Synthesis & Catalysis, 2010

We report a highly efficient, general and practical method for the aldol condensation of acetone with aromatic and aliphatic aldehydes, using morpholinium trifluoroacetate as a catalyst.


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