Synthesis of hydrosilanes via Lewis-base-catalysed reduction of alkoxy silanes with NaBH4

2019 ◽  
Vol 55 (42) ◽  
pp. 5859-5862 ◽  
Author(s):  
Keiya Aoyagi ◽  
Yu Ohmori ◽  
Koya Inomata ◽  
Kazuhiro Matsumoto ◽  
Shigeru Shimada ◽  
...  
Keyword(s):  
Lewis Base ◽  
Base Catalyst ◽  
Hexamethylphosphoric Triamide

Hydrosilanes were synthesized by reduction of alkoxysilanes with BH3 in the presence of hexamethylphosphoric triamide (HMPA) as a Lewis-base catalyst. The reaction was also achieved using an inexpensive and easy-to-handle handled hydride source NaBH4, which reacted with EtBr as a sacrificial reagent to form BH3in situ.

In situ phosphonium-containing Lewis base-catalyzed 1,6-cyanation reaction: facile way to α-diaryl and α-triaryl acetonitriles

2021 ◽  
Author(s):  
Jian-Ping Tan ◽  
Yuan Chen ◽  
Xiaoyu Ren ◽  
Yumeng Guo ◽  
Bing Yi ◽  
...  
Keyword(s):  
Butyl Acrylate ◽  
Lewis Base ◽  
Base Catalyst ◽  
Tert Butyl ◽  
Cyanation Reaction

Herein, we presente a phosphonium-containing catalyst generated in situ from phosphine and tert-butyl acrylate serves as an unusual Lewis base catalyst, and its successful application in promoting remote 1,6-cyanation reaction...

Formamide Catalysis Facilitates the Transformation of Aldehydes into Geminal Dichlorides

Synthesis ◽  
2019 ◽  
Vol 51 (12) ◽  
pp. 2474-2483 ◽  
Author(s):  
Peter Helmut Huy
Keyword(s):  
Nucleophilic Substitution ◽  
Substitution Reaction ◽  
Functional Group ◽  
Lewis Base ◽  
Base Catalyst ◽  
Reaction Conditions ◽  
Novel Method ◽  
In Situ Formation ◽  
Type Intermediate

Herein, a novel method for the transformation of aldehydes into geminal dichlorides based on phthaloyl chloride as reagent and N-formylpyrrolidine as Lewis base catalyst is disclosed. Given the mild reaction conditions, the current protocol is distinguished by high levels of functional group compatibility and scalability and is operationally simple. The in situ formation of a Vilsmeier Haack reagent type intermediate is likely to be essential for this organocatalytic nucleophilic substitution reaction.

[6 + 3] Annulations of Morita–Baylis–Hillman Carbonates and Dicyanoheptafulvene

2021 ◽  
Author(s):  
Yang Song ◽  
Ruo-Ling Jia ◽  
Shi Deng ◽  
Long-Wei Yang ◽  
Qing-Ling Liu
Keyword(s):  
Lewis Base ◽  
Base Catalyst

An [6 + 3] annulation reaction of Morita-Baylis-Hillman carbonates and dicyanoheptafulvene is accomplished by employing commercially available triphenylphosphine as the Lewis base catalyst. A spectrum of densely functionalized bicyclo[4.3.1]decane architectures...

Dual Iminium- and Lewis Base Catalyzed Morita–Baylis–Hillman Reaction on Cyclopent-2-enone

Synlett ◽  
2017 ◽  
Vol 29 (06) ◽  
pp. 820-824 ◽  
Author(s):  
Andrea Trabocchi ◽  
Riccardo Innocenti ◽  
Gloria Menchi
Keyword(s):  
Experimental Evidence ◽  
Lewis Base ◽  
Secondary Amines ◽  
Nucleophilic Attack ◽  
Allylic Alcohols ◽  
Base Catalyst ◽  
Co Catalysts

The application of iminium catalysis to the challenging Morita–Baylis–Hillman reaction on cyclopenten-2-one leads to the corresponding allylic alcohols in excellent yields. Experimental evidence shows that secondary amines act as co-catalysts activating the enone moiety towards the nucleophilic attack at the β-position by DABCO as the Lewis base catalyst, resulting in an augmented nucleophilic character towards the reaction with aldehydes.

Visible Light-Driven Biginelli Reaction over Mesoporous g-C3 N4 Lewis-Base Catalyst

2018 ◽  
Vol 3 (14) ◽  
pp. 4009-4014 ◽  
Author(s):  
Vidyasagar Devthade ◽  
Gopichand Kamble ◽  
Sachin G Ghugal ◽  
Kishor H. Chikhalia ◽  
Suresh S Umare
Keyword(s):  
Visible Light ◽  
Biginelli Reaction ◽  
Lewis Base ◽  
Base Catalyst ◽  
Visible Light Driven
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