Diisopropyl-phosphoramidous acid (2R,3S,5S)-2-[bis-(4-methoxy-phenyl)-phenyl-methoxymethyl]-5-pyren-1-yl-tetrahydro-furan-3-yl ester 2-cyano-ethyl ester 、
6-bromohexyl 2-cyanoethyl diisopropylphosphoramidite 、 3-(4,4'-dimethoxytrityloxy)propyl 2-cyanoethyl (N,N-diisopropyl)phosphoramidite 在
3'-phosphate CPG column 作用下,
以
乙腈 为溶剂,
生成