Dimethyl azulene-1,2-dicarboxylates are reduced with a 4–5 molar excess of DIBAH in Et2O/hexane at 0° to yield the corresponding 2-(hydroxymethyl)-1-methylazulenes which can be further reduced to 1,2-dimethylazulenes on treatment with Et3SiH in TFA at 60° (cf. the Table).
在0°下,用Et 2 O /己烷中的D
IBAH减少4-5摩尔过量的D
IBAH,以还原二甲基a并1,2-二
羧酸酯,生成相应的2-(羟甲基)-1-甲基az -dimethylazulenes上用Et治疗3的SiH在TFA在60℃(参见该表)。