Nielsen J, Taagaard M, Marugg J E, van Boom J H, Dahl O
Nucleic Acids Res. 1986 Sep 25;14(18):7391-403. doi: 10.1093/nar/14.18.7391.
Deoxyribonucleoside phosphoramidites are prepared in situ from 5'-O,N-protected deoxyribonucleosides and 2-cyanoethyl N,N,N',N'-tetraisopropylphosphorodiamidite with tetrazole as catalyst, and the solutions applied directly on an automatic solid-phase DNA synthesizer. Using LCAA-CPG support and a cycle time of 12.5 min, oligonucleotides of 16-25 bases are obtained with a DMT-efficiency per cycle of 98.0-99.3%. The crude and fully deblocked products are of a purity comparable to that obtained using purified phosphoramidites. In case of d(G)16 the product was difficult to analyse and a better product was not obtained using doubly protected (O-6 diphenylcarbamoyl) guanine.
脱氧核苷亚磷酰胺是由5'-O,N-保护的脱氧核苷和2-氰基乙基N,N,N',N'-四异丙基亚磷二酰胺在四唑作为催化剂的条件下原位制备的,所得溶液直接应用于自动固相DNA合成仪。使用LCAA-CPG载体和12.5分钟的循环时间,可获得16 - 25个碱基的寡核苷酸,每个循环的DMT效率为98.0 - 99.3%。粗产物和完全脱保护的产物的纯度与使用纯化的亚磷酰胺所获得的纯度相当。对于d(G)16,产物难以分析,并且使用双保护(O-6二苯基甲酰基)鸟嘌呤也未获得更好的产物。