Modified nucleosides or nucleotides

摘要

Some embodiments described herein relate to modified nucleotide and nucleoside molecules with novel 3'-hydroxy protecting groups. Said 3'-hydroxy protecting groups form a structure -O-C(R)2N3 covalently attached to the 3'-carbon atom wherein R is as defined n the claims. Also provided herein are methods to prepare such modified nucleotide and nucleoside molecules and sequencing by synthesis processes using such modified nucleotide and nucleoside molecules.