Synthesis of 4-Alkylidene-4<i>H</i>-3,1-benzoxazine Derivatives by Acid-Catalyzed Cyclization
of 2-Isocyanophenyl Ketones in the Presence of a Vinyl Ether
作者:Kazuhiro Kobayashi、Yuta Okamura、Hisatoshi Konishi
DOI:10.1055/s-0028-1087997
日期:——
2-(1-Alkoxyalkyl)-4-alkylidene-4H-3,1-benzoxazines are conveniently prepared by the reaction of 1-(2-isocyanophenyl)ethanones or 1-(2-isocyanophenyl)propan-1-ones with a vinyl ether, such as 2-methoxypropene or ethyl vinyl ether, in the presence of a catalytic amount of (±)-camphor-10-sulfonic acid. 4H-3,1-benzoxazines - acid-catalyzed reaction - fused-ring system - isocyanides - vinyl ethers
2-(1-烷氧基烷基)-4-亚烷基-4 H -3,1-苯并恶嗪可通过1-(2-异氰基苯基)乙炔或1-(2-异氰基苯基)丙-1-酮与环己烯的反应方便地制备。乙烯基量,例如2-甲氧基丙烯或乙基乙烯基醚,在催化量的(±)-樟脑-10-磺酸的存在下。 4 H -3,1-苯并恶嗪-酸催化反应-稠环系统-异氰酸酯-乙烯基醚