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Polyamine‐Carbodiimides are new water‐soluble activating agents designed to fit some requirements of chemical ligations of oligodeoxynucleotide 3′‐phosphates. N‐Alkyl‐N′‐(4,9,13‐trimethyl‐4,9,13‐triazatetradecyl)carbodiimides 9 have been prepared from 4,9,13‐trimethyl‐4,9,13‐triazatetradecylamine (2b), a N‐methylated derivative of spermine (2a), via the respective thioureas 8. An efficient total synthesis of the polyamine 2b has been elaborated in which the carbon‐nitrogen framework of 2b is assembled through succesive N‐alkylations of tosylamides as the key steps starting from N‐[4‐(tosylamido)butyl]formamide (4d), N‐(3‐iodopropyl)‐N‐methyl‐p‐toluenesulfonamide (3c), and 1‐bromo‐3‐chloropropane (3a). The polyamine 2b could be obtained via seven steps (3c + 4d → 5a, 5a → 5b, 5b → 5c, 5c + 3a → 6b, 6b → 6d, 6d → 6f, 6f → [6g] → 2b) in 40% overall yield.
European Journal of Organic Chemistry – Wiley
Published: Apr 16, 1989
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