作者:Arndt M. Brückner、Harald W. Schmitt、Ulf Diederichsen
DOI:10.1002/1522-2675(200211)85:11<3855::aid-hlca3855>3.0.co;2-a
日期:2002.11
The synthesis of thyminyl-, uracilyl-, cytosinyl-, and guaninyl-beta(3)-amino acids and the oligomerization of the cytosinyl- and guaninyl-beta(3)-amino acids to beta-homoalanyl-PNA are presented. The pyrimidinyl nucleobases were connected to the gamma-position of beta-homoalanine by Mitsunobu reaction with a beta-homoserine derivative or by nucleophilic substitution of methanesulfonates. For the preparation of the guaninyl-beta(3)-amino acid, a beta-lactam route was established that might be of interest also for the synthesis of other beta(3)-amino acid derivatives. The cytosinyl and guaninyl building blocks were oligomerized to hexamers. They form quite stable self-pairing complexes in H2O as indicated by temperature dependent UV and CD spectroscopy.