+++Thanks_quino_eFO_1 article from synthesis & tetrahedron

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1. Le Roux, Antoine; Marsault, Eric:
Efficient Synthesis of 2-Ureaguanines via the in situ Reactions of 2-Isocyanatopurines with Amines
Synthesis 2013; 45(14): 1983-1990

DOI:

http://dx.doi.org/10.1055/s-0033-1338482

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https://www.thieme-connect.de/ejournals/abstract/10.1055/s-0033-1338482

2. Synthesis of N-substituted aziridine-2-carboxylates Original Research Article
Tetrahedron, Volume 33, Issue 8, 1977, Pages 881-883
Zmira Bernstein, Dov Ben-Ishai
Tetrahedron 1977, 33, 881-883.

DOI:

http://dx.doi.org/10.1016/0040-4020(77)80039-2

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http://www.sciencedirect.com/science/article/pii/0040402077800392

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