Regioselective alkylations of optically active 4,5-dihydro-1,2,4-triazin-6(1H)-ones
摘要:
Regiocontrolled alkylations of chiral 4,5-dihydrotriazin-6-ones using sodium hydride in DMF are reported. By this approach different N1-alkyl, N1,N4-dialkyl and N4-alkyl dihydrotriazinones could be obtained in good yields with conservation of their optical activity. (C) 2000 Published by Elsevier Science Ltd. All rights reserved.
甘氨酸,S-丙氨酸,S-苯丙氨酸和S-脯氨酸的N-酰基衍生物的乙酯2通过使用2,4-双(4-甲氧基苯基)-1,3,2,4-二硫代二膦烷2进行亚硫酰化,4-二硫键(Lawesson试剂)1。使N-硫酰基化合物3与水合肼反应,并且在大多数情况下发生闭环反应,得到1,2,4-三嗪衍生物4。通过1 H,13 C和15 N NMR光谱获得4的结构证明。