Shouldn't one start with an aklyl-halide or triflate and NaN3 in some solvent, to make the alkyl-azide?! Interesting reaction with the triphenyl-borane. And, well explained mechanism! But, I suppose there are more ways to convert the alkylazides into the corresponding primary amines. NaN3, has about the same acute toxicity as NaCN. Some azides are rather unstable, even explosive, I have learned. I don't know what organic azides, and under which conditions it's problematic when working with and storing them. But the inorganic salts, lead azide and silver azide, are or have been used as primary explosives in blasting caps. Triflic azide is said to possibly spontaneously explode on storage and handling. I have not handled any other azide than NaN3, and only as a preservative in small amounts added to stock solutions of buffers for biochemistry. So, please check with the labels or MSDS.
@CVPQ
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You can start from alkyl halide/triflate or alternatively you can do a Mitsunobu using hydrazoic acid in which case it provides a OH to NH2 conversion route that doesn't scramble the stereochemistry.
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