A convenient synthesis of 2,3,5,6-tetrahalogenopyridines and of 3,5-bis(alkylthio)pyridines from 2,6-diaminopyridine
作者:Ted K. Chen、William T. Flowers
DOI:10.1039/c39800001139
日期:——
Controlled chlorination of 2,6-diaminopyridine (1) affords 2,6-diamino-3,5-dichloropyridine (2a) which is then bis(diazotised) to give 2,3,5,6-tetrachloropyridine (3a); similarly prepared are other 2,3,5,6-tetra(chloro/bromo)pyridines and 2,6-dichloro-3,5-bis(thiocyanato)pyridine (3h), from which 3,5-bis(alkylthio)pyridines are easily obtained.
2,6-二氨基吡啶(1)的受控氯化得到2,6-二氨基-3,5-二氯吡啶(2a),然后将其双(重氮化)得到2,3,5,6-四氯吡啶(3a)。类似地制备了其他2,3,5,6-四(氯/溴)吡啶和2,6-二氯-3,5-双(硫氰酸根)吡啶(3h),其中有3,5-双(烷硫基)吡啶容易获得。