abstract |
The present invention provides a method for producing guanidine crosslinked artificial nucleic acid (abbreviated hereinafter as GuNA), and an intermediate compound for the production thereof. Specifically, the present invention provides a method for producing a compound represented by general formula I: (in the formula, R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , m and ring A are as defined in the specification) or a salt thereof wherein a reducing agent is reacted with a compound represented by general formula II: (in the formula, R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , m, and ring A′ are as defined in the specification). |