LETTER
Guanidine Bases in Synthesis
773
MS (ES, NH3): m/z = 259 [M + NH4]+, 242 [M + H]+.
Vasse, J.-L.; Winn, C. L. J. Am. Chem. Soc. 2003, 125,
10926.
HRMS (ES, NH3): m/z calcd for C14H15O3N2 [M + NH4]+:
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259.1077; found: 259.1082.
Acknowledgment
These studies have enjoyed generous financial support from the
Engineering and Physical Sciences Research Council. The authors
thank the EPSRC National Mass Spectrometry Service, Swansea
University, UK. The authors are indebted to Dr. S. D. Kean (Uni-
versity of Glamorgan) and Dr. N. C. O. Tomkinson (Cardiff Univer-
sity) for their continued advice, support, and inspiration.
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Synlett 2010, No. 5, 769–773 © Thieme Stuttgart · New York