1-Formyl-7-isopropyl-4-methylazulene (4) has been synthesized by DDQ oxidation method of 1-methyl group of guaiazulene (1). The overall synthetic procedures from 1 to 4 were completed within 2 h, and almost quantitative yield was achieved. The compound (4) was inaccessible so far, because of a poor yield of 4 in its total synthesis (<5%, overall), as well as in its preparation by non-selective oxidation of 1 (<1%).
1-Formyl-7-isopropyl-4-methylazulene (4) 是通过
DDQ 氧化法合成瓜亚唑烯(1)的 1-甲基。从 1 到 4 的整个合成过程在 2 小时内完成,几乎达到定量收率。由于 4 的总合成收率较低(总收率小于 5%),以及通过 1 的非选择性氧化法制备 4 时的收率较低(小于 1%),因此迄今为止还无法获得化合物 (4)。