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

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).

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

 

2-({3-Methyl-6-[(3R)-3-piperidinylamino]-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl}methyl)-4-fluorobenzonitrile (8)

Mp: 90 °C decomposed.

 

1H NMR (400 MHz, CD3OD) δ (ppm): 7.85–7.89 (m, 1H), 7.25–7.28 (m, 1H), 6.96–6.99 (m, 1H), 5.37–5.51 (m, 2H), 4.84 (s, 1H), 3.42–3.49 (m, 1H), 3.28 (s, 3H), 3.11–3.15 (m, 1H), 2.89–2.93 (m, 1H), 2.46–2.58 (m, 2H), 1.92–1.95 (m, 1H), 1.48–1.70 (m, 3H).

 

MS (ESI+): m/z, 358.06 ([M + H]+).

A two-step efficient preparation of a renewable dicarboxylic acid monomer 5,5[prime or minute]-[oxybis(methylene)]bis[2-furancarboxylic acid] from D-fructose and its application in polyester synthesis

 

Green Chem., 2017, 19,1570-1575
DOI: 10.1039/C6GC03314H, Paper

Ananda S. Amarasekara, Loc H. Nguyen, Nnaemeka C. Okorie, Saad M. Jamal
A renewable monomer 5,5[prime or minute]-[oxybis(methylene)]bis[2-furancarboxylic acid] from D-fructose.

A two-step efficient preparation of a renewable dicarboxylic acid monomer 5,5′-[oxybis(methylene)]bis[2-furancarboxylic acid] from D-fructose and its application in polyester synthesis

Ananda S. Amarasekara,*a   Loc H. Nguyen,a  Nnaemeka C. Okoriea and   Saad M. Jamala  

*Corresponding authors

aDepartment of Chemistry, Prairie View A&M University, Prairie View, USA
E-mail: asamarasekara@pvamu.edu
Fax: +1 936 261 3117
Tel: +1 936 261 3107

Green Chem., 2017,19, 1570-1575

DOI: 10.1039/C6GC03314H

D-Fructose was converted to the dialdehyde 5,5′-[oxybis(methylene)]bis[2-furaldehyde] by heating at 110 °C in DMSO with the Dowex 50 W X8 solid acid catalyst in 76% yield without the isolation of the intermediate 5-hydroxymethylfurfural. This dialdehyde was then converted to the dicarboxylic acid monomer, 5,5′-[oxybis(methylene)]bis[2-furancarboxylic acid], using oxygen (1 atm.) and 5% Pt/C catalyst in 1.5 M aqueous NaOH at room temperature in 98% yield. The new dicarboxylic acid monomer can be considered as a renewable resource based alternative to terephthalic acid as demonstrated by the preparation of polyesters with 1,2-ethanediol and 1,4-butanediol in 87–92% yield.

 

Synthesis of 5,5'-[oxybis(methylene)]bis[2-furancarboxylic acid]

 

pale yellow crystals. 260 mg, 98 % yield. M.pt. 207-209 °C, Lit. M. pt. 209-210 °C 37 .

 

IR (ATR) 761, 891, 951, 1029, 1059, 1159, 1208, 1283, 1342, 1424, 1525, 1674, 3128 cm-1

 

1 H NMR (DMSO-d6 ) δ 3.38 (2H, bs, 2XCOOH), 4.51 (4H, s, 2X-CH2O ), 6.61 (2H, d, J = 3.6 Hz, C-4,4'), 7.15 (2H, d, J = 3.6 Hz, C-3,3').

 

13C NMR (DMSO-d6 ) δ 63.8, 112.2, 118.8, 145.3, 155.5, 159.6

37. T. Iseki and T. Sugiura, J. Biochem., 1939, 30, 113-118.

 

NMR PREDICT

1H NMR PREDICT

 

 

 

13C NMR PREDICT

 

 

//////////////O=C(O)c2ccc(COCc1ccc(o1)C(=O)O)o2

5,6-dihydropteridin-7(8H)-one

5,6-dihydropteridin-7(8H)-one

 

Org. Process Res. Dev., 2017, 21 (1), pp 11–17

DOI: 10.1021/acs.oprd.6b00219

/////////////

Regioselective access of alkylidendibenzo[c,f]oxocine framework via cyclocarbopalladation/cross-coupling cascade reactions and reductive Heck strategy

Regioselective access of alkylidendibenzo[c,f]oxocine framework via cyclocarbopalladation/cross-coupling cascade reactions and reductive Heck strategy

New J. Chem., 2017, Advance Article
DOI: 10.1039/C6NJ03825E, Paper

Tapas Ghosha  

a

Institute of Organic Chemistry, University of Würzburg, Am Hubland, 97074 Würzburg, Germany
E-mail: tapas.ghosh@uni-wuerzburg.de,tapasghosh.chem@gmail.com
Tel: +49-931-31-81629

New J. Chem., 2017, Advance Article

DOI: 10.1039/C6NJ03825E
Palladium-catalyzed dual strategies of cascade cyclocarbopalladation/cross-coupling of alkynes and a reductive Heck reaction have been developed to construct dibenzo[c,f]oxocine frameworks with tri- and tetra-substituted exo-cyclic alkenes with high stereo- and regio-control.

Palladium-catalyzed dual strategies of cascade cyclocarbopalladation/cross-coupling of alkynes and a reductive Heck reaction have been developed to construct dibenzo[c,f]oxocine frameworks with tri- and tetra-substituted exo-cyclic alkenes with high stereo- and regio-control. The success of this efficient methodology has been demonstrated by the synthesis of a number of dibenzoxocines in moderate to good yields and in sufficient quantities to support their further development.

 

http://pubs.rsc.org/en/Content/ArticleLanding/2017/NJ/C6NJ03825E?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+rss%2FNJ+%28RSC+-+New+J.+Chem.+latest+articles%29#!divAbstract

 

12-benzylidene-7,12-dihydro-5H-dibenzo[c,f]oxocine (8a): The material obtained after workup was subjected to column chromatography on silica gel with petroleum ether/EtOAc (19:1) as eluent to deliver pure 8a. Off white solid, yield = 82%,

 

mp. 134-136 oC,

 

IR (KBr): 2861, 1623, 1602 cm-1 , 1H NMR (400 MHz, CDCl3): δH = 7.47 (d, 1H, J = 7.2 Hz), 7.19-7.34 (m, 5H), 7.05-7.15 (m, 5H), 6.94-6.96 (m, 2H), 6.64 (s, 1H), 4.87 (s, 2H), 4.75 (s, 2H).

 

13C NMR (100 MHz, CDCl3): δC = 144.6, 142.1, 138.3, 137.4, 136.9, 129.9, 129.1, 128.9, 128.6, 128.3, 128.1, 127.9, 127.4, 127.0, 126.7, 73.0, 70.3.

 

HRMS (ESI [M+Na]+ ): for C22H18O calcd 321.1255; found 321.1245.

 

 

 

///////Regioselective, alkylidendibenzo[c,f]oxocine, cyclocarbopalladation/cross-coupling cascade reactions, reductive Heck strategy

Asymmetric total synthesis of (-)-δ-lycorane

1H NMR

13C NMR

Org. Chem. Front., 2017, Advance Article
DOI: 10.1039/C7QO00021A, Research Article

Junliang Wang, Jianneng Li, Xianwang Shen, Cong Dong, Jun Lin, Kun Wei
A first asymmetric synthesis of (-)-δ-lycorane by using a chiral bifunctional squaramide-catalysed cascade reaction is reported.

Asymmetric total synthesis of (−)-δ-lycorane

Junliang Wang,ab   Jianneng Li,a   Xianwang Shen,a  Cong Dong,a   Jun Lin*ab and   Kun Wei*a  

*Corresponding authors

aSchool of Chemical Science and Technology, Yunnan University, P. R. China

bSchool of Chemical Science and Technology, Yunnan University, Key Laboratory of Medicinal Chemistry for Natural Resource (Ministry of Education), Kunming, P. R. China
E-mail: weikun@ynu.edu.cn, linjun@ynu.edu.cn
Fax: +86871 65031633
Tel: +86871 65031633

Org. Chem. Front., 2017, Advance Article

DOI: 10.1039/C7QO00021A

A first asymmetric synthesis of the lycorine-type Amaryllidaceae alkaloid (−)-δ-lycorane by using a chiral bifunctional squaramide-catalysed cascade reaction as a powerful tool to construct the skeleton of the alkaloid on the basis of unsaturated β-ketoester and nitroalkene is reported. The sequence afforded a highly functionalized intermediate with three stereogenic centres with high diastereoselectivity (>20:1 dr) and high enantioselectivity (92% ee) in one step, which was converted into (−)-δ-lycorane in eight steps.

The residue was purified by flash silica 8 Please do not adjust margins Please do not adjust margins Please do not adjust margins gel chromatography (DCM/MeOH = 10/1) to give (−)-δ-lycorane (9 mg, 72%) as a white solid.

m.p.: 125-126 °C; [α] = -51.9, (c = 0.1, CHCl3);

IR (thin film, ν cm -1): 3551, 3477, 3414 , 1637, 1617, 619, 473;

1H-NMR (500 MHz, CDCl3), δ (ppm): 6.79 (s, 1H), 6.68 (s, 1H), 5.93 (s, 2H), 4.29 (d, J = 14.5 Hz, 1H), 3.95 (dd, J = 11.0, 8.5 Hz, 1H), 3.68 (d, J = 14.5 Hz, 1H), 3.52 (dd, J = 11.5, 4.0 Hz, 1H), 3.25 (s, 1H), 2.50 (m, 1H), 2.41 (d, J = 2.0 Hz, 1H), 1.86 (m, 1H), 1.77 (m, 2H), 1.66 (d, J = 14.5 Hz, 1H), 1.59 (m, 2H), 1.37 (m, 2H);

13C-NMR (125 MHz, CDCl3) δ (ppm): 149.0, 146.5, 131.3, 120.5, 109.5, 106.9, 101.5, 66.3, 55.1, 50.7, 39.7, 34.5, 29.6, 29.0, 24.8, 20.4;

HRMS (ESI): m/z calcd for C16H20NO2 + [M + H]+ : 258.1489, found: 258.1488.

////(−)-δ-lycorane

4-Pentenoic acid, 5-(3,4-methylenedioxyphenyl)-3-oxo-, ethyl ester

4-Pentenoic acid, 5-(3,4-methylenedioxyphenyl)-3-oxo-, ethyl ester

cas 860547-52-0

MF C14 H14 O5

4-Pentenoic acid, 5-(1,3-benzodioxol-5-yl)-3-oxo-, ethyl ester

Molecular Weight, 262.26

Melting Point (Experimental)

Value: 58-60 °C

Purification of the residue by flash column chromatography (10% ethyl acetate in hexanes) afforded the β-keto ester (12.0 g, 90%) as a pale yellow oil. Compound 3

1H-NMR (400 MHz, CDCl3), δ (ppm):12.00 (s, 0.4 H, enol OH), 7.52 (d, 1H, J = 16.0 Hz, C5 keto ), 7.35 (t, J = 15.6, 1H, C6’ keto), 7.05 (complex, 1.4H, C2’ keto, C2’ enol ), 7.03 (d, J = 12.8, 1H, C5’ keto), 6.97 (d, J = 8.0 Hz, 0.5H, C5’ enol), 6.83-6.78 (m, 1.5H, C6’, C5 and C2 enol), 6.65 (d, J = 16.0 Hz, 1H, C4 keto), 6.27 (d, J = 16 Hz, 0.5H, C4 enol), 6.02 (s, 2H, C7’ keto), 5.98 (s, 1H, C7’ enol), 4.22 (complex, 3H, COOCH2CH3, keto and enol), 3.66 (s, 2H, C2 keto), 1.29 (complex, 4.7H, COOCH2CH3 keto and enol);

13C-NMR (100 MHz, CDCl3), δ (ppm): 191.7, 172.8, 169.4, 167.5, 150.2, 148.8, 148.4, 148.2, 144.4, 136.4, 129.8, 128.4, 125.4, 123.5, 123.2, 119.9, 108.6, 108.5, 106.6, 106.1, 101.7, 101.4, 91.3, 77.3, 77.0, 76.7, 61.4, 60.1, 47.6, 14.2, 14.1.

 

1H NMR PREDICT

 

13C NMR PREDICT

 

/////////

Org. Chem. Front., 2017, Advance Article,
DOI: 10.1039/C7QO00021A

and

1. English, James, Jr.; Journal of the American Chemical Society 1943, V65, P2466-7 
2. (2) Borsche, W.; Berichte der Deutschen Chemischen Gesellschaft [Abteilung] B: Abhandlungen 1933, V66B, P1792-801 

O=C(OCC)CC(=O)/C=C/c1ccc2OCOc2c1