DR ANTHONY MELVIN CRASTO,WorldDrugTracker, helping millions, A 90 % paralysed man in action for you, I am suffering from transverse mylitis and bound to a wheel chair, With death on the horizon, nothing will not stop me except God................DR ANTHONY MELVIN CRASTO Ph.D ( ICT, Mumbai) , INDIA 25Yrs Exp. in the feld of Organic Chemistry,Working for GLENMARK GENERICS at Navi Mumbai, INDIA. Serving chemists around the world. Helping them with websites on Chemistry.Million hits on google, world acclamation from industry, academia, drug authorities for websites, blogs and educational contribution

Sunday 30 April 2017

Continuous niobium phosphate catalysed Skraup reaction for quinoline synthesis from solketal

STR1
Continuous niobium phosphate catalysed Skraup reaction for quinoline synthesis from solketal
Green Chem., 2017, Advance Article
DOI: 10.1039/C6GC03140D, Paper
Jing Jin, Sandro Guidi, Zahra Abada, Zacharias Amara, Maurizio Selva, Michael W. George, Martyn Poliakoff
Solketal is derived from the reaction of acetone with glycerol, a by-product of the biodiesel industry. We demonstrate the use of NbOPO4 as a catalyst for the conversion of solketal and anilines to quinolines
STR0
STR1
STR2
str3
str4
Synthesis of 4-(quinolin-6-yl methyl)aniline (6a)
The reaction was carried out accordingly to the general procedure. The purification of 4-(quinoline-6-yl methyl)aniline 6a was carried out with a gradient of polarity from 80:20 to 30:70 (v/v) of CyHex:AcOEt as eluent. 1H NMR (400 MHz, CDCl3) δ ppm: 8.85 (dd, J=4.3,1.7Hz, 1H), 8.07 (dd, J=8.3,1.8Hz, 1H), 8.01 (d, J=9.2Hz, 1H), 7.58–7.54 (m, 2H), 7.36 (dd, J=8.3,4.2Hz, 1H), 7.02 (d, J=8.3Hz, 2H), 6.67–6.63 (m, 2H), 4.06 (s, 2H). 13C NMR (100 MHz, CDCl3) δ ppm: 149.9, 147.3, 144.9, 140.7, 135.9, 131.4, 130.6, 130.1, 129.5, 128.5, 126.6, 121.2, 115.5, 41.2. HRMS-ESI for C16H15N2 [M+H]+ calculated 235.1235, found 235.1245.


Continuous niobium phosphate catalysed Skraup reaction for quinoline synthesis from solketal

Abstract

Solketal is derived from the reaction of acetone with glycerol, a by-product of the biodiesel industry. We report here the continuous reaction of solketal with anilines over a solid acid niobium phosphate (NbP), for the continuous generation of quinolines in the well-established Skraup reaction. This study shows that NbP can catalyse all the stages of this multistep reaction at 250 °C and 10 MPa pressure, with a selectivity for quinoline of up to 60%. We found that the catalyst eventually deactivates, most probably via a combination of coking and reduction processes but nevertheless we show the promise of this approach. We demonstrate here the application of our approach to synthesize both mono- and bis-quinolines from the commodity chemical, 4,4′-methylenedianiline.

No comments:

Post a Comment