The photochromic spirobenzopyran was incorporated as an internal modification into oligonucleotides by two different synthetic strategies: For the first route the spiropyran phosphoramidite was synthesized as a DNA building block, whereas for the second route the postsynthetic ‘click’-type ligation was applied. Photoinduced ring opening of the chromophore could not be achieved in duplex DNA.
                                    通过两种不同的合成策略,光致变色螺
吡喃被作为内部修饰引入到寡核苷酸中:第一条路线是将螺
吡喃膦酰胺合成作为DNA构建模块,而第二条路线则采用了后合成“点击”型连接反应。在双链DNA中,色素的光诱导开环未能实现。