Patent ID: 6962991

Claim:
A PPG phosphoramidite comprising a photolabile hydroxy protecting group, wherein said phosphoramidite nucleoside is of the formula: wherein R 1 is selected from the group consisting of hydrogen and alkyl; R 2 is selected from the group consisting of hydrogen, alkyl, and an amine protecting group, or R 1 and R 2 together form an amine protecting group; each of Z 1 , Z 2 , Z 4 , and Z 6 is independently selected from the group consisting of hydrogen, halide, alkyl, —OR 11 , wherein each R 11 is independently selected from the group consisting of hydrogen, alkyl, and a hydroxy protecting group or two R 11 groups form a diol protecting group, or Z 2 and Z 4 together with the carbon atoms to which they are attached and C-3 carbon atom of the carbohydrate ring form a five-to seven membered ring; and one of Z 3 or Z 5 is —OR 12 and the other is —OR 13 , where R 12 is a photolabile hydroxy protecting group and R 13 is a phosphoramidite.