A new cleavage strategy for the solid-phase synthesis of secondary amines
β Scribed by Paolo Conti; Dennis Demont; Jos Cals; Harry C.J. Ottenheijm; Dirk Leysen
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- French
- Weight
- 210 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0040-4039
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β¦ Synopsis
The clean and efficient cleavage of N-benzyl linked tertiary amines from a solid support (e.g. 4) by treatment with ct-chloroethyl chloroformate (ACE-CI) / methanol to yield secondary amines 7 is described. This allows the solid-phase synthetic transformation of the secondary amine 2 into 7. When the Merrifleld resin l is used the N-tethered amine-polymeric matrix ensemble is stable towards a wide variety of reaction conditions.
π SIMILAR VOLUMES
A novel linker for the solid-phase synthesis of secondary amines based on an intramolecular cyclization was developed. The linker allows for a stepwise built-up of the secondary amines on the support. The feasibility was demonstrated in the parallel synthesis of a small set of different secondary am
with K-selectride to afford the desired hydroxy compound 24. Desilylation of 24 with HF ' py gave the hydroxy oxime 25. The C=N bond of 25 was reduced with NaBH,CN providing the desired product 26 together with its C4 epimer.[131 Finally, chromatographically purified 26 was deprotected to the target
Ring-closing olefin metathesis using the Grubbs catalyst was applied to the cyclisative release of resin-bound sulfonamides. Flexible linkers apparently facilitated the cyclisation-cleavage, allowing a number of novel cyclic sulfonamides to be prepared in good yields using catalytic amounts of the G