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Density Functional Study on the Mechanism of Amadori Rearrangement Reaction.pdf
30卷 6期 结 构 化 学 (JIEGOUHUAXUE) Vo1.30,No.6
20l1.6 Chinese Struct. Chem. 827~832
DensityFunctionalStudyontheM echanism
ofAmadoriRearrangementReaction
BAOXiu-Xiu CHENZu..Qin XIEHu..Jun~
(DepartmentofAppliedChemistry,SchoolofFoodScienceandBiotechnology,
ZhejiangGongshangUniversity,Hangzhou310035,China)
ABSTRACT Thereactionmechanism ofamadorirearrangementin theinitialstageofMaillard
reactionhasbeen investigatedbymeansofdensity functionaltheorycalculationsinthegaseous
phaseandaqueoussolution.Cyclicriboseandglycineweretakenasthemodelinhteamadori
rearrangement.Reactionmechanismshavebeen proposed,nadpossibility fortheformation of
differentcompoundshasbeenevaluatedthroughcalculatinghterelativeenergychnagesfordifferent
stepsofhtereactionbyfollownigthetotalmassbalance.Tllecalculationsrevealhtathteamadofi
rearrnagementinitializedviatheintramolecularrearrnagement,trnasferringoneprotonfromN(3)to
O(4)atom.Inhtenextstep,thesecondprotonisalsortansferredrfom N(3)to0(4)atom,
correspondingtohtecleavageofC(4)一O(4)bondandhtereleaseofonewatermolecule.Then
anohterprotonistransferredrfomN(3)toC(5)atom viaTS3wihtthereactionbarrierof58.3
kcal’otolaftertunnelnigtheeffectcorrectioncalculatedatmeB3L /6-31+G(d)leveloftheory,
nadthisstep isratelimitingforhtewholecaatlyticcycle.Ultimately,hteproductisgeneratedvia
keto-enolicatutomerization.Presentcalculationcouldprovideinsightsintohtereactionmechanism
ofMaillardreaction since experimentalevaluationoftheroleofintermediatesin theMaillard
reactionisqui钯 complicated.
Keywords:DFTcalculations,amadorirearrangementreaction,
interstellarmedinm,maiIlardreaction
1 INTRoDUCTIoN
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