Synthesis of 3,4,5,6‐Tetrahydro‐2<i>H</i>‐1,3,4‐oxadiazin‐2‐ones Employing a Metal Hydride and Diethyl Carbonate: An Alternative Cyclization Method over 1,1′‐Carbonyldiimidazole
作者:David M. Casper、David Kieser、Jennifer R. Blackburn、Shawn R. Hitchcock
DOI:10.1081/scc-120028356
日期:2004.12.31
Abstract A series of 3,4,5,6‐tetrahydro‐2H‐1,3,4‐oxadiazin‐2‐ones have been synthesized from valine, leucine, ephedrine, and norephedrine. The synthesis is accomplished through a process of nitrosation, reduction, and cyclization. The cyclization protocol employed involves the use of a metal hydride (LiH or NaH) and diethyl carbonate rather than 1,1′‐carbonyldiimidazole.
摘要 从缬氨酸、亮氨酸、麻黄碱和去甲麻黄碱合成了一系列 3,4,5,6-四氢-2H-1,3,4-oxadiazin-2-ones。合成是通过亚硝化、还原和环化过程完成的。所采用的环化方案涉及使用金属氢化物(LiH 或 NaH)和碳酸二乙酯,而不是 1,1'-羰基二咪唑。