氰基甲基一方面可以作为氨基的保护基，另一方面在银离子或者铜离子的催化作

On the one hand, the cyanomethyl group can be used as the protecting group of the amino group. On the other hand, under the catalysis of the silver ion or the copper ion, the cyano group is also a good leaving group to initiate the reaction. Bromoacetonitrile is usually used to accomplish such a conversion. In our experiments, we have also found that using methoxymethyl to protect amino groups can also complete similar conversions under the catalysis of acid, but this method has not been reported. <br>d. From the acylimide ion conversion. <br>This is an unusual type of acquisition method, and only two cases have been reported so far [47]. The above discussions are all simple imine ions, but this kind of imine ions is a more complicated type of imine ions. It should be said that the rearrangement reaction of such imine ions is more difficult. It can also be seen from the following reaction that the reaction yield is low enough to explain the difficulty of the reaction.

Cyanide methyl can be used as an amino protection base on the one hand, on the other hand, under the catalytic action of silver or copper ions, cyanide is also a good departure group, and then initiate the occurrence of the reaction. Bromoethylene is usually used to complete such a transformation. In our experiments, we have also found that the use of methoxymethyl to protect amino, in the catalytic action of acids, can also complete similar transformations, but this method has not been reported.<br> D. Converted from acrylamide ions.<br>This is an unusual type of acquisition, and only two cases have been reported so far. All of the above are simple subamine ions, and this kind of subamine ion is a more complex kind of subamine ions, it should be said that the re-displacement reaction of such subamine ions is more difficult. As can be seen from the following reactions, the low reaction yield is sufficient to indicate the difficulty of the reaction.

On the one hand, cyanomethyl can be used as the protective group of amino group. On the other hand, under the catalysis of silver ion or copper ion, cyano group is also a good leaving group, which can start the reaction. Such a conversion is usually accomplished with bromoacetonitrile. In our experiments, we have also found that using methoxymethyl to protect amino groups can also complete similar conversion under the catalysis of acid, but this method has not been reported.<br>d. It is converted from acylimide ions.<br>This is a kind of uncommon acquisition method, and only two cases have been reported so far [47]. All of the above are simple imine ions, but this kind of imine ions is a kind of more complex imine ions. It should be said that the rearrangement reaction of these imine ions is relatively difficult. As can be seen from the following reactions, the low yield of the reaction is enough to illustrate the difficulty of the reaction.<br>