2-Chloroadenosine → 2-Thioadenosine

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Reaction Steps

The starting material, the 2-thioadenosine of the formula (IV), used in the above Process 2 can be obtained in high yield from 2-chloroadenosine of the formula (II) by the procedure disclosed in Japanese Patent Application OPI No. 52,795/1973. That is, 2-chloroadenosine is reacted with sodium hydrogen sulfide in a solvent such as dimethylformamide at a temperature of about 50°C to 100°C to obtain the desired 2-thioadenosine of the formula (IV) in about 100% yield. The preparation of the starting material of the formula (IV) will be hereinafter described in greater detail in Reference Example 2.

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