Bulletin of the Chemical Society of Japan p. 892 - 899 (1993)
Update date:2022-08-11
Topics:
Yasunami, Masafumi
Miyoshi, Shiro
Kanegae, Noriko
Takase, Kahei
Methyl 3-alkylazulene-1-carboxylates were synthesized in high yields by the reaction of 3-methoxycarbonyl-2H-cycloheptafuran-2-one with in situ generated morpholine enamines of aldehydes.Treatment of the esters with 100percent phosphoric acid gave 1-alkylazulenes in excellent yields.Azulene was also synthesized in a good yield via methyl azulene-1-carboxylate with a modification of this method.
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