溴乙烷 、
3-酞酰亚胺基丙酸甲酯 、 trimethoxonium tetrafluoroborate 生成 (3S,6R)-3-Ethyl-2,5-dimethoxy-3,6-dimethyl-3,6-dihydropyrazin 、 (3S,6S)-3-Ethyl-2,5-dimethoxy-3,6-dimethyl-3,6-dihydropyrazin 、 (3R,6R)-3-Ethyl-2,5-dimethoxy-3,6-dimethyl-3,6-dihydropyrazin 、
(3R,6S)-3-Ethyl-2,5-dimethoxy-3,6-dimethyl-3,6-dihydropyrazin