Patent ID: 8691970

Claim:
A phosphoramidite compound represented by general formula (1), wherein: B X represents a nucleobase optionally having a protecting group selected from the group consisting of benzoyl, 4-methoxybenzoyl, acetyl, propionyl, butyryl, isobutyryl, phenylacetyl, phenoxyacetyl, 4-tert-butylphenoxyacetyl, 4-isopropylphenoxyacetyl, and (dimethylamino)methylene; R 1 is a substituent represented by general formula (2), wherein: R 11 , R 12 , and R 13 are the same Or different and each represents hydrogen or C1-C4 alkoxy; R 2a and R 2b are the same or different and each represents C1-C5 alkyl, or R 2a and R 2b taken together with the adjacent nitrogen atom represent pyrrolidine-1-yl, piperidine-1-yl, morpholine-1-yl, or thiomorpholine-1-yl; and WG 1 and WG 2 are the same or different, WG 1 represents cyano, and WG 2 represents cyano, nitro, C1-C5 alkylsulfonyl, or halogen.