Improved method for the synthesis of (E)-cyclic-β-alkoxyacrylates under mild conditions
作者:Keisuke Kato、Akira Nishimura、Yasuhiro Yamamoto、Hiroyuki Akita
DOI:10.1016/s0040-4039(01)00689-x
日期:2001.6
The oxidative cyclization–methoxycarbonylation of cyclic- and acyclic-4-yn-1-ols 1 in the presence of Pd(II)/p-benzoquinone in methanol at 0°C under a carbon monoxide atmosphere (balloon) afforded (E)-cyclic-β-alkoxyacrylates 2 in good to excellent yields. The present reaction is applicable to the above-mentioned substrates bearing the additional functional groups such as acetate, hydroxyl, ketone
在Pd(II)/对苯甲醌在甲醇中于0°C,一氧化碳气氛(气球)存在下,环状和无环4-yn-1-ols 1的氧化环化-甲氧基羰基化得到(E)-环状-β-烷氧基丙烯酸酯2的收率为好至极好。本反应适用于带有附加官能团如乙酸盐,羟基,酮,酯,末端乙炔和酸敏感性保护基(TBDPS,TBDMS,MOM和THP)的上述底物。提出了巯基噻唑左侧部分的新合成方法。