Month: March 2017

2-{[6-Chloro-3-methyl-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl]methyl}-4-fluorobenzonitrile

DR ANTHONY MELVIN CRASTO Ph.D ORGANIC CHEMISTRY, spectroscopy, Synthesis

2-{[6-Chloro-3-methyl-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl]methyl}-4-fluorobenzonitrile (4)

white solid . Mp: 193–195 °C.
1H NMR (400 MHz, CDCl3) δ (ppm): 7.74–7.76(m, 1H), 7.14–7.17 (m, 1H), 6.95–6.97 (m, 1H), 6.05 (s, 1H), 5.51 (s, 2H), 3.40 (s, 3H).

Efficient synthesis of isoquinolines in water by a Pd-catalyzed tandem reaction of functionalized alkylnitriles with arylboronic acids

DR ANTHONY MELVIN CRASTO Ph.D ORGANIC CHEMISTRY, spectroscopy, STRUCTURE ELUDICATION, Synthesis , ,

Efficient synthesis of isoquinolines in water by a Pd-catalyzed tandem reaction of functionalized alkylnitriles with arylboronic acids

Green Chem., 2017, Advance Article
DOI: 10.1039/C7GC00267J, Paper
Kun Hu, Linjun Qi, Shuling Yu, Tianxing Cheng, Xiaodong Wang, Zhaojun Li, Yuanzhi Xia, Jiuxi Chen, Huayue Wu
Pd-catalyzed tandem reaction of functionalized alkylnitriles with arylboronic acids for the synthesis of diverse isoquinolines in water.

Efficient synthesis of isoquinolines in water by a Pd-catalyzed tandem reaction of functionalized alkylnitriles with arylboronic acids

Kun Hu,a   Linjun Qi,a   Shuling Yu,a   Tianxing Cheng,a  Xiaodong Wang,a   Zhaojun Li,b   Yuanzhi Xia,a  Jiuxi Chen*a and   Huayue Wua  
*Corresponding authors
aCollege of Chemistry & Materials Engineering, Wenzhou University, Wenzhou 325035, China
E-mail: jiuxichen@wzu.edu.cn
bInstitute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Key Laboratory of Plant Nutrition and Fertilizer, Ministry of Agriculture, Beijing, China
Green Chem., 2017, Advance Article

DOI: 10.1039/C7GC00267J, 

A palladium-catalyzed tandem reaction of 2-(cyanomethyl)benzonitriles or 2-(2-carbonylphenyl)acetonitriles with arylboronic acids in water has been developed for the first time. This reaction features good functional group tolerance and provides a new strategy for the synthesis of diverse isoquinolines under mild conditions. The use of water as the reaction medium makes the synthesis process environmentally benign. Preliminary mechanistic experiments indicate that the major reaction pathway involves carbopalladation of the C(sp3)–cyano group and subsequent intramolecular cyclization findings that were further supported by density functional theory (DFT) calculations.
Capture
STR1

1,3-Diphenylisoquinoline (3a). Pale-yellow solid (103.5 mg, 92%),

mp 78-79 oC (lit.24,  73-74.5 oC). 24 J. D. Tovar and T. M. Swager, J. Org. Chem., 1999, 64, 6499

1H NMR (500 MHz, CDCl3) δ 8.25-8.23 (m, 2H), 8.15-8.14 (m, 1H), 8.09 (s, 1H), 7.95-7.93 (m, 1H), 7.84-7.83 (m, 2H), 7.70-7.67 (m, 1H), 7.59-7.50 (m, 6H), 7.44-7.40 (m, 1H);

13C NMR (125 MHz, CDCl3) δ 160.5, 150.3, 140.1, 139.8, 138.0, 130.4, 130.2, 128.8, 128.7, 128.6, 128.4, 127.7, 127.6, 127.2, 127.0, 126.0, 115.8.

//////// isoquinoline, pd-catalyzed, arylboronic acids

Resolution of Thiele’s acid

DR ANTHONY MELVIN CRASTO Ph.D ORGANIC CHEMISTRY

Resolution of Thiele’s acid

Jun Chen,a XuXin Sun,a Allen G. Oliver,b Jeremy E. Wulffa

aDepartment of Chemistry, University of Victoria, P.O. Box 3065 STN CSC, Victoria, BC V8W 3V6, Canada.

bMolecular Structure Facility, Department of Chemistry and Biochemistry, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, IN 46556, USA.

Corresponding author: Jeremy E. Wulff (e-mail: ).

ABSTRACT

Thiele’s acid has been resolved for the first time by diastereomeric salt formation with brucine. Determination of absolute stereochemistry was accomplished by X-ray crystallography of the corresponding diester. We anticipate that access to optically resolved Thiele’s acid will stimulate its use in a diverse range of applications requiring chiral molecular clefts.

Canadian Journal of Chemistry, 2017, 95(3): 234-238, 10.1139/cjc-2016-0125

STR0.JPG

 

str1

(–)-Thiele’s ester 2a as a white solid (200 mg, 81%). Spectral data were consistent with the racemic compound that has been described previously in the literature.5 [α]D 25 = –216 deg mL dm-1 g-1 (c = 0.25, ethanol solution). MP = 87–89 °C.

CCDC 1469300 contains the supplementary crystallographic data for compound (–)-2a. These data are available from the Cambridge Crystallographic Data Centre.