13C and15N NMR chemical shift assignments ofN-1-(2- azidoethyl)-4-R-pyrimidin-2-ones by1H,X HMQ(B)C withz-gradient selection
作者:Erkki Kolehmainen、Kari Lappalainen、David Šaman、Antonin Holý、Jaroslav Günter
DOI:10.1002/(sici)1097-458x(199806)36:6<442::aid-omr314>3.0.co;2-g
日期:1998.6
C-13 and N-15 NMR chemical shift assignments based on z-gradient selected H-1,X (X = C-13 and N-15) HMQC and NMBC experiments are reported for N-1-(2-azidoethyl)pyrimidin-2-one (ring system of cytosine), its five 4-R derivatives [where R = NH2, OCH3, N(CH2)(4), NHCH2CH(CH3)(2) and N(CH3)(2)] and 2-azidoethyl tosylate. The possibilities of detecting all nitrogens in these molecules containing (i) an azido group at N-1 and (ii) an electronegative substituent at C-4 are limited. First, the terminal nitrogen of the azido group is difficult to observe because the nearest proton (in a CH2 group) is located four bonds away from it. Second, in contrast to N-1, N-3 in N-1-(2-azido-ethyl)-4-pyrimidin-2-ones remained undetected. For that reason, an unsubstituted derivative (R = H) was also prepared, where N-3 was easily observed. (C) 1998 John Wiley & Sons, Ltd.