Organic compounds -- part of the class 532-570 series – Organic compounds – Nitrogen attached directly or indirectly to the purine ring...
Reexamination Certificate
2005-05-24
2005-05-24
Wilson, James O. (Department: 1624)
Organic compounds -- part of the class 532-570 series
Organic compounds
Nitrogen attached directly or indirectly to the purine ring...
Reexamination Certificate
active
06897311
ABSTRACT:
A process for the preparation of compound of formula (I A), decahydro-2a,4a,6a,8a-tetraazacyclopent[fg]accnaphthylene and the corresponding functionalized compounds of general formula (I), intermediates for the preparation of 1,4,7,10-tetraazacyclododecane (II A) and corresponding derivatives (II), by preparation of compounds of general formula (III) and subsequent reduction thereof.
REFERENCES:
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Herve et al; “Condensation of Glyoxal with Triethylenetetraamine; Isomerisation and Cyclisation”; Eur. J. Org. Chem., 2000, pp. 33-35, XP002175525.
Gerve et al; “Condensation of Glyoxal with Triethylenetetraamine. Stereochemistry, Cyclization and Deprotection”; Tetrahedron LETT., vol. 40, 1999, pp. 2517-2520, XP002175526.
Ferrari et al; “A Pratical Synthesis of 1, 4, 7, 10-Tetraazacyclododecane, A Pivotal Precursor for MRI Contrast Agents” Synthetic Communication, vol. 30, No. 1, 2000, pp. 15-21, XP001012734.
Brown et al, “Selective Reductions. 29. A Simple Technique To Achieve an Enhanced Rate of Reduction of Representative Organic Compounds by Borane-Dimethyl Sulfide”,J. Org. Chem. 1982, vol. 47, No. 16, pp. 3153-3163.
Argese Maria
Brocchetta Marino
Manfredi Giuseppe
Rebasti Fabrizio
Ripa Giorgio
Bracco International BV
Nixon & Vanderhye P.C.
Tucker Zachary C.
Wilson James O.
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