Sodium Borohydride as the Only Reagent for the Efficient Reductive Alkylation of Malononitrile with Ketones and Aldehydes
作者:Robert E. Sammelson、Jason C. Dunham、Adam D. Richardson
DOI:10.1055/s-2006-926307
日期:——
malononitriles has been developed. In this method, sodium borohydride in isopropanol has a catalytic effect on the initial condensation between malononitrile and aldehydes or ketones at 0 °C. The sodium borohydride also simultaneously acts as a reagent and reduces the unsaturated intermediate formed in situ by the condensation. This simple reductive alkylation method effectively consumes all malononitrile
Potassium tert-Butoxide Mediated Arylation of 2-Substituted Malononitriles Using Diaryliodonium Salts
作者:Jianwei Han、Limin Wang、Xiaofei Qian、Bowen Xu
DOI:10.1055/s-0036-1589061
日期:2017.10
Direct arylation of 2-substituted malononitriles using diaryliodonium salts without involving transition-metal catalysts was developed. By using potassiumtert-butoxide as a promoter, the desired 2-substituated α-arylmalononitriles derivatives were synthesized in good to excellent yields of 55–96%. This synthetic method provided an efficient way to prepare a variety of 2-substituted arylmalononitriles
A Convenient Heterogeneous Reduction of Knoevenagel Product by Hantzsch Ester and Its Development into Reductive Alkylation of Malononitrile
作者:Yong-Qing Yang、Zheng Lu
DOI:10.1002/cjoc.201400144
日期:2014.7
Poor solubility of Hantzschester is used as indicator in the reduction of methylidene malononitrile. The Knoevenagel reaction is integrated to develop a reductivealkylation of malononitrile with aryl and aliphatic aldehyde as the carbonyl substrate.
Phosphoramidites Are Efficient, Green Organocatalysts for the Michael Reaction. Mechanistic Insights into the Phosphorus-Catalyzed Michael Reaction of Alkynones and Implications for Asymmetric Catalysis
作者:Robert B. Grossman、Sébastien Comesse、Ravindra M. Rasne、Kazuyuki Hattori、Matthew N. Delong
DOI:10.1021/jo026425g
日期:2003.2.1
Hexamethylphosphorous triamide (HMPT) and other phosphoramidites and phosphites have been found to be efficient catalysts for the Michael reaction of alkenones and alkynones with malonates, (x-cyano, esters, beta-keto esters, and nitro compounds. The relatively nontoxic, easily hydrolyzed HMPT catalyzes the Michael reaction within seconds at room temperature in the absence of a solvent, and the reaction is worked up simply by removing the catalyst in vacuo. The Michael reactions of alkynones, unlike those of alkenones, are shown to be irreversible. The implications for asymmetric catalysis are discussed.
Echevarria Aurea, Martin Manuel, Perez Concepcion, Rozas Isabel, Arch. Pharm, 327 (1994) N 5, S 303-305
作者:Echevarria Aurea, Martin Manuel, Perez Concepcion, Rozas Isabel