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2004
Guanidine derivatives
Q 0660
Optimization of the Synthesis of Guanidines from Amines via Nitroguanidines
3,5-Dimethyl-N-nitro-1H-pyrazole-1-carboxamidine. — The synthesis of the
45- 102 Using
carboxamidine (IV) is optimized. It can be used as a reagent to prepare N-alkylguanidines such as (IX) via nitroguanidines such as (VI). The guanidine purification problem
is solved by the use of a weak acid ion exchange resin. A comparison with two other
guanidinylating reagents is made. — (CASTILLO-MELENDEZ, J. A.; GOLDING*,
B. T.; Synthesis 2004, 10, 1655-1663; Sch. Nat. Sci., Univ. Newcastle, Newcastle
upon Tyne NE1 7RU, UK; Eng.) — C. Herrmann
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