Supporting Information.docx

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Supporting Information.docx

SupportingInformation

SupportingInformation

AmassspectrometrybasedmethodfordifferentiationofpositionalisomersofmonosubstitutedpyrazineN-oxidesusingmetalioncomplexes

MatiasButlerandGabrielaM.Cabrera

DepartamentodeQuímicaOrgánica,UMyMFOR-CONICET,FacultaddeCienciasExactasyNaturales,UniversidaddeBuenosAires,CiudadUniversitaria,PabellónII,3ºpiso,C1428EHA,BuenosAires,Argentina.

FigureS1.ESImassspectrarecordedforproducedmetalionadductsoftheregio-isomericN-oxidesof2-chloropyrazine1aand3-chloropyrazine1bwiththemetalions,top:

calcium(II),middle:

copper(II)andbottom:

aluminum(III).

FigureS2.ESImassspectrarecordedforproducedmetalionadductsoftheregio-isomericN-oxidesof2-aminopyrazine2aand3-aminopyrazine2bwiththemetalions,top:

calcium(II),middle:

copper(II)andbottom:

aluminum(III).

FigureS3.ESImassspectrarecordedforproducedmetalionadductsoftheregio-isomericN-oxidesof2-methylpyrazine3aand3-methylpyrazine3bwiththemetalions,top:

calcium(II),middle:

copper(II)andbottom:

aluminum(III).

FigureS4.ESImassspectrarecordedforproducedmetalionadductsoftheregio-isomericN-oxidesof2-acetylpyrazine4aand3-acetylpyrazine4bwiththemetalions,top:

calcium(II),middle:

copper(II)andbottom:

aluminum(III).

FigureS5.ESImassspectrarecordedforproducedmetalionadductsoftheregio-isomericN-oxidesof2-carboxypyrazine5aand3-carboxypyrazine5bwiththemetalions,top:

calcium(II),middle:

copper(II)andbottom:

aluminum(III).

FigureS6.ESImassspectrarecordedforproducedmetalionadductsoftheregio-isomericN-oxidesof2-methoxypyrazine7aand3-methoxypyrazine7bwiththemetalions,top:

calcium(II),middle:

copper(II)andbottom:

aluminum(III).

FigureS7.ESImassspectrarecordedforproducedmetalionadductsoftheregio-isomericN-oxidesof2-acetamidopyrazine8aand3-acetamidopyrazine8bwiththemetalions,top:

calcium(II),middle:

copper(II)andbottom:

aluminum(III).

FigureS8.ESImassspectrarecordedforproducedmetalionadductsoftheregio-isomericN-oxidesof2-(1-hydroxyethyl)pyrazine9aand3-(1-hydroxyethyl)pyrazine9bwiththemetalions,top:

calcium(II),middle:

copper(II)andbottom:

aluminum(III).

FigureS9.ESImassspectrarecordedforproducedmetalionadductsoftheregio-isomericN-oxidesof2-(methoxycarbonyl)pyrazine10aand3-(methoxycarbonyl)pyrazine10bwiththemetalions,top:

calcium(II),middle:

copper(II)andbottom:

aluminum(III).

FigureS10.ESImassspectrarecordedforproducedmetalionadductsoftheregio-isomericN-oxidesof2-carbamoylpyrazine11aand3-carbamoylpyrazine11bwiththemetalions,top:

calcium(II),middle:

copper(II)andbottom:

aluminum(III).

FigureS11.PCAanalysisofthedataobtainedforproducedmetalionadductsoftheregio-isomericpyrazineN-oxides(1a-11a;1b-11b)withcopper(II).a)scoresplot;b)loadingsplot(Seethetextforthenumericalcodeinterpretation).

FigureS12.PCAanalysisofthedataobtainedforproducedmetalionadductsoftheregio-isomericpyrazineN-oxides(1a-11a;1b-11b)withaluminum(III).a)scoresplot;b)loadingsplot(Seethetextforthenumericalcodeinterpretation).

TableS1.SummaryofthemostsignificantaionsobservedintheESImassspectracompounds1a-11a;1b-11bwithcalcium(II);observedm/z(errorinppm).Valuesinboldindicatethemostabundantionforeachcompound.*Peakoverlapobserved.aIonswithrelativeintensitieshigherthan5%.Thelargestpeakoftheisotopedistributionisgiven.

Code

Ion/Compound

1a

1b

2a

2b

3a

3b

4a

4b

5b

6a

6b

7a

7b

8a

8b

9a

9b

10a

10b

11ª

11b

211

[M+Ca]++

84.9771

(3.7)

84.9777

(3.0)

89.0024

(2.4)

89.0027

(5.2)

83.0019

(3.3)

96.5077(10.2)

90.0104

(4.1)

96.9998

(0.8)

96.9992

(4.9)

89.4996

(2.2)

89.4993

(6.0)

2111

[M+Ca+H2O]++

93.9833

(6.4)

93.9825

(2.3)

98.0077

(2.1)

98.0077

(1.7)

92.0069

(6.0)

105.5139(9.0)

99.0151

(2.7)

106.0053(3.3)

106.0047

(2.6)

98.5049

(2.7)

98.5044

(7.1)

2112

[M+Ca+2H2O]++

102.9900

*

102.9875

(5.0)

107.0126

(2.1)

107.0131

(3.0)

101.0124(3.7)

114.5180(1.7)

114.5188(4.7)

108.0206(0.1)

115.0108(5.2)

115.0103

(0.7)

107.5105(0.7)

107.5105(0.8)

2113

[M+Ca+3H2O]++

111.9939

(5.4)

111.9928

(4.3)

116.0178

(1.9)

116.0184

(2.7)

110.0195(13.0)

123.5233(1.4)

123.524

(4.1)

117.0259(0.3)

124.0159(2.9)

124.0157

(1.3)

116.5159(2.1)

116.5153(3.4)

2114

[M+Ca+4H2O]++

 

120.9979

(5.3)

 

132.5286(1.5)

133.0210

(1.2)

125.5204(4.4)

11

[M+H]+

131.0012

(4.0)

130.9996

(8.3)

112.0510

(3.8)

112.0523

(16.1)

111.0554

(0.9)

111.0561

(7.3)

139.0499

(2.5)

139.0508

(4.5)

141.0294

(0.4)

141.0301

(4.4)

113.0349(3.4)

113.0353(6.3)

127.0495(5.9)

127.0497

(4.3)

154.0593(11.4)

154.0611(0.2)

141.0660(1.2)

141.0663(3.4)

155.0444(4.9)

155.0445(3.8)

140.0450

(3.0)

140.0449(4.0)

110

[M+Na]+

152.9826

(0.2)

134.0332

(5.4)

161.0317

(3.0)

161.0313

(5.1)

163.012

(3.6)

135.0160

(3.4)

135.0160

(3.7)

149.0312(6.7)

176.0406(14.1)

176.0422(4.7)

163.0468(5.8)

163.0481(1.7)

177.0272(0.8)

177.0269(0.6)

162.0277(0.2)

111

[M+Ca-H]+

149.9983

(5.4)

150.0000

*

176.9997

(14.5)

176.9995(13.3)

178.9777

(7.0)

178.9787(13.0)

150.9821(4.3)

150.9832(11.5)

192.0087(3.6)

179.0139(6.0)

179.0152(13.2)

177.9904(11.2)

1111

[M+Ca+H2O-H]+

168.0081

(0.1)

168.0090

(5.8)

167.0117

(6.8)

195.0086

(4.4)

195.008

(1.5)

196.9886

(8.3)

196.9884

(7.4)

168.9923(1.3)

168.9923(1.5)

210.0196(4.9)

210.0201(7.0)

197,0234(0.5)

197.0236(1.4)

211.0042(7.4)

196.0039(4.6)

196.0036(3.1)

1112

[M+Ca+2H2O-H]+

186.0174

(6.5)

213.0184

(0.6)

213.0154

*

214.9984

(4.1)

214.9984

(4.0)

187.0024(1.2)

186.9980

*

228.0268(10.4)

228.0260(13.9)

215.0281

*

215.0361(10.1)

229.0147(6.6)

229.0092

*

214.0107(13.2)

214.0120(7.1)

11101

[M+Ca+35Cl]+

204.9252

(4.6)

204.9253

(4.8)

185.9790

*

184.9794(2.7)

184.9816

*

212.9721

(8.1)

212.9691

*

186.9590(4.4)

186.9550

*

200.9747(4.4)

200.9746(3.9)

227.9877

(13.1)

214.9909(6.6)

214.9896(0.6)

228.9667(8.9)

228.9708(9.1)

213.9642

*

213.9656

*

11111

[M+Ca+35Cl+H2O]+

222.9351

(1.0)

222.9349

(0.2)

203.9864

(8.2)

202.9887(3.6)

202.9911

(8.2)

230.9854

(4.5)

230.9856

(5.3)

204.9650

*

204.9682(2.6)

218.9852(3.9)

245.9928(10.1)

233.0019(8.0)

232.9973(11.8)

246.9816(9.2)

246.9805(4.7)

231.9808(4.8)

231.9812(6.7)

11121

[M+Ca+35Cl+2H2O]+

240.9448

(2.6)

240.9448

(2.7)

221.9965

(5.6)

220.9987(6.1)

221.0012

(5.1)

248.9945

(1.7)

222.9800(3.0)

236.9954(1.7)

264.0073(5.5)

264.9914(5.8)

249.9894(3.1)

221

[2M+Ca]++

149.9747

(3.8)

149.975

(5.5)

131.0237

(2.5)

130.0284(2.4)

130.0288

(0.6)

158.0239

(1.3)

158.0235

(1.0)

146.0231(4.1)

146.0232

(3.5)

160.0399(0.0)

174.0192(3.7)

174.0193(4.0)

159.0190(0.2)

2211

[2M+Ca+H2O]++

158.9805

(6.6)

158.9793

(0.7)

140.0292

(0.8)

139.0338(1.7)

139.0346

(3.7)

167.0296

(3.7)

167.0298

(5.2)

141.0125(5.7)

141.0133(0.1)

155.0286(2.5)

155.0289

(0.4)

182.0391(4.3)

169.0444(0.9)

169.0444(1.1)

183.0251(6.9)

183.0245(3.3)

168.0250(4.6)

168.0219(13.9)

2212

[2M+Ca+2H2O]++

167.9860

(7.5)

167.9845

(1.2)

149.0353

(4.7)

148.0393

(0.1)

148.0406

(8.6)

176.0348

(3.2)

176.0348

(3.1)

150.0178(5.6)

164.0340

(1.3)

164.0348

(3.5)

191.0456(2.5)

178.0494(2.8)

178.0497(1.3)

192.0297(3.0)

192.0299(3.7)

177.0283(6.6)

177.0300(2.8)

2213

[2M+Ca+3H2O]++

176.9903

(1.9)

176.9895

(2.8)

158.0400

(0.8)

157.0432(8.7)

157.0451

(2.9)

 

159.0224(9.1)

173.0393

(1.4)

200.0515(5.5)

187.0557(3.1)

121

[2M+Ca-H]+

261.0412

(1.6)

 

315.0412

(3.5)

263.0098(3.8)

263.0097(3.4)

345.0611(2.3)

319.0716(0.8)

319.0706(2.3)

317.0314(2.5)

1211

[2M+Ca+H2O-H]+

279.0519

(2.3)

337.0111

(5.9)

337.0094

(0.8)

281.0201(2.8)

281.0189

(1.6)

363.0705(5.3)

337.0816(1.1)

337.0809(3.1)

365.0405(0.2)

1212

[2M+Ca+2H2O-H]+

 

355.0197

(4.3)

 

 

12101

[2M+Ca+35Cl]+

334.9153

(7.0)

334.9130

(14.0)

297.0197

(7.6)

295.0252(5.9)

295.0284

(5.0)

351.0168

(0.1)

351.0172

(1.4)

298.9858

(1.2)

327.0183(4.8)

327.0184

(4.9)

355.0489(2.5)

355.0486(1.6)

383.0076(2.7)

383,0064(0,4)

353.0071(0.5)

12111

[2M+Ca+35Cl+H2O]+

352.9279

(1.0)

352.9302

(14.8)

315.0286

(2.0)

313.0355(6.3)

313.0379

(1.5)

316.9952

(2.6)

345.0271(0.7)

345.0278

(1.4)

373.0575(2.9)

401.0170(0.4)

231

[3M+Ca]++

214.9684

(11.4)

186.5466

(5.1)

185.049

*

227.0457

(2.5)

227.0462

(4.8)

209.0460

(4.0)

209.0465

(6.7)

230.0686(0.0)

230.0688(0.7)

251.0378(1.2)

251.0376(0.5)

228.5391(4.7)

2311

[3M+Ca+H2O]++

223.9759

(0.9)

195.5519

(4.8)

194.0589

(4.4)

236.0508

(1.8)

 

218.0498(2.9)

239.0747(3.4)

13101

[3M+Ca+35Cl]+

 

408.0598

(2.2)

 

495.1061(1.0)

241

[4M+Ca]++

 

 

 

300.0987(2.6)

TableS2.SummaryofthemostsignificantaionsobservedintheESImassspectra

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