Novel nucleotide compounds represented by the formula (I)
wherein R1 represents a protective group or a PEG bearing organic group; R2, R2′, R2″, R3, R3′ and R3″ each represents a hydrogen atom or an alkyl, cycloalkyl, aryl or aralkyl group which may contain a hetero-atom; B1, B2, B3 and B4 each represents a base, if necessary, protected by a protective group common in nucleotide chemistry or by a PEG bearing organic group; X, X′ and X″ each represents an oxygen atom or a sulfur atom; Y represents an azolyl group, a mono- or di-alkylamino group or a saturated nitrogenous heterocyclic ring; A1, A2, A3 and A4 each represents a hydrogen atom, a hydroxyl group, an alkoxy group or a trialkylsilyloxy group; and m and n each represents 0 or an integer of 1 to 100. The nucleotide of the formula (I) can be used as it is in a reaction mixture for further reaction with 3′-O- and 5′-O-unprotected nucleoside or nucleotide of the formula (II) to yield a nucleotide block or oligonucleotide, and thus is useful as in situ DNA synthesis reagents.
式(I)所表示的新型核苷酸化合物,其中R1代表保护基或带有P
EG有机基团;R2、R2'、R2''、R3、R3'和R3''分别代表氢原子或含有杂原子的烷基、环烷基、芳基或芳烷基;B1、B2、B3和B4分别代表碱基,如有必要,可用核苷酸
化学中常见的保护基或带有P
EG有机基团保护;X、X'和X''分别代表氧原子或
硫原子;Y代表
吡唑基、单烷基或二烷基
氨基基团或饱和的氮杂环;A1、A2、A3和A4分别代表氢原子、羟基、烷氧基或三烷基
硅氧基;m和n分别代表0或1到100的整数。式(I)的核苷酸可以直接用于反应混合物中,进一步与式(II)的3'-O-和5'-O-未保护核苷酸或核苷酸反应,形成核苷酸块或寡核苷酸,因此可用作原位DNA合成试剂。