502162-95-0Relevant academic research and scientific papers
Reuse of chiral cationic Pd-phosphinooxazolidine catalysts in ionic liquids: Highly efficient catalytic asymmetric Diels-Alder reactions
Takahashi, Kouichi,Nakano, Hiroto,Fujita, Reiko
, p. 263 - 265 (2007)
Chiral cationic palladium-phosphinooxazolidine catalysts in ionic liquid afforded excellent enantioselectivity in Diels-Alder reactions and the catalyst was easily recycled eight times without any significant decrease in chemical yields or enantioselectiv
The first catalytic enantioselective Diels-Alder reactions of 1,2-dihydropyridine: Efficient syntheses of optically active 2-azabicyclo[2.2.2]octanes with chiral BINAM derived Cr(III) salen complexes
Takenaka, Norito,Huang, Yong,Rawal, Viresh H.
, p. 8299 - 8305 (2002)
We have synthesized a new family of enantiomerically enriched BINAM-derived Schiff base Cr(III) complexes and evaluated them as catalysts for Diels-Alder reactions. These complexes effectively catalyze, for the first time, the enantioselective Diels-Alder reactions between 1,2-dihydropyridine and N-acryloyloxazolidinone to afford 2-azabicyclo[2.2.2]octanes in high yields (89-99%) and with moderate to good enantioselectivities (79-85%).
Asymmetric synthesis of isoquinuclidines by Diels-Alder reaction of 1,2-dihydropyridine utilizing a chiral Lewis acid catalyst
Seki, Chigusa,Hirama, Masafumi,Hutabarat, N.D.M. Romauli,Takada, Junko,Suttibut, Chonticha,Takahashi, Hideto,Takaguchi, Takuya,Kohari, Yoshihito,Nakano, Hiroto,Uwai, Koji,Takano, Nobuhiro,Yasui, Mitsukuni,Okuyama, Yuko,Takeshita, Mitsuhiro,Matsuyama, Haruo
, p. 1774 - 1781 (2012/03/10)
The chiral isoquinuclidine derivative, 2-azabicyclo[2.2.2]octane ring system, endo-(7R)-3 was obtained in good yield with excellent diastereoselectivity (up to 92% de) by Diels-Alder reaction of 1-(phenoxycarbonyl)-1,2-dihydropyridine 1 with N-acryloyl-(4S)-4- benzyloxazolidin-2-one (4S)-2 using titanium-(2R,3R)-TADDOLate 4 as a chiral Lewis acid catalyst in toluene at 0 °C. On the other hand, endo-(7S)-3 was obtained in good yield with excellent diastereoselectivity (up to 97% de) by Diels-Alder reaction of 1 with (4R)-2 using Cu(OTf)2/(4S,4′S)- bis(oxazoline) catalyst 8 as a chiral Lewis acid catalyst in dichloromethane at 0 °C. In these reactions, the choice of solvent and the combination of titanium-(2R,3R)-TADDOLate 4 {or Cu(II)/(4S,4′S)-bis(oxazoline) 8} and dienophile (4S)-2 {or (4R)-2} are very important. The stereochemistry of endo-(7R)-3 has been established to be (1R,4S,7R) and the reaction mechanism is proposed.
Reactivity and efficient recycling of a chiral Pd-BINAP catalyst for catalytic asymmetric Diels-Alder reaction in ionic liquid
Nishiuchi, Yasuhiro,Nakano, Hiroto,Araki, Yuta,Sato, Rina,Fujita, Reiko,Uwai, Koji,Takeshita, Mitsuhiro
experimental part, p. 1323 - 1331 (2010/10/20)
Chiral cationic palladium-BINAP catalyst in ionic liquid showed an excellent asymmetric catalytic activity in the Diels-Alder reactions using several dienes and the catalyst was easily recycled 7 times with good chemical yield and excellent enantioselecti
The highly enantioselective Diels-Alder reaction of 1,2-dihydropyridine using chiral cationic palladium-phosphinooxazolidine catalyst for the synthesis of chiral isoquinuclidines
Nakano, Hiroto,Tsugawa, Natsumi,Fujita, Reiko
, p. 5677 - 5681 (2007/10/03)
The enantioselective Diels-Alder reactions of 1-phenoxycarbonyl-1,2- dihydropyridine with 1-alkylated acryloyl-pyrazolidin-3-ones using chiral cationic palladium-phosphinooxazolidine (Pd-POZ) catalyst afforded chiral isoquinuclidines with excellent enanti
