Use of a <sup>13</sup>C Atom To Differentiate Two <sup>15</sup>N-Labeled Nucleosides. Syntheses of [<sup>15</sup>NH<sub>2</sub>]-Adenosine, [1,NH<sub>2</sub>-<sup>15</sup>N<sub>2</sub>]- and [2-<sup>13</sup>C-1,NH<sub>2</sub>-<sup>15</sup>N<sub>2</sub>]-Guanosine, and [1,7,NH<sub>2</sub>-<sup>15</sup>N<sub>3</sub>]- and [2-<sup>13</sup>C-1,7,NH<sub>2</sub>-<sup>15</sup>N<sub>3</sub>]-2‘-Deoxyguanosine
作者:Hong Zhao、Alex R. Pagano、Weimin Wang、Anthony Shallop、Barbara L. Gaffney、Roger A. Jones
DOI:10.1021/jo971206u
日期:1997.10.1
We report the first examples of the specifically N-15 and C-13 multilabeled nucleosides: [1,NH2-N-15(2)]- and [2-C-13-1,NH2-N-15(2)-]-guanosine; [1,7,NH2-N-15(3)]- and [2-C-13-1,7,NH2-N-15(3)]-2'-deoxyguanosine. In each set, the [C-13] atom functions as a ''tag'' that allows the N1 and N2 N-15 atoms of two N-15-labeled guanines to be unambiguously differentiated in RNA and DNA fragments. The syntheses employ high-yield reactions in which protecting groups are not required and use relatively low cost sources of isotopes: [N-15]-ammonium chloride and [N-15]- Or [C-13,N-15]-potassium cyanide.