Studies on Cu(I)-catalyzed synthesis of simple 3-substituted 1,2-allenes and optically active 2-substituted secondary 2,3-allenols
作者:Jing Li、Chao Zhou、Chunling Fu、Shengming Ma
DOI:10.1016/j.tet.2009.02.061
日期:2009.5
methyl ethers, which would react with primary alkyl Grignard reagents under the catalysis of CuBr to afford 3-substituted 1,2-allenes or 2-substituted secondary 2,3-allenols, respectively. The reaction may be applied to the synthesis of optically active 2-substituted secondary 2,3-allenols with up to >99% ee without any protection to the free hydroxyl group in the starting 4-hydroxy-2-alkynyl methyl
用n -BuLi和MOMCl顺序处理末端炔烃或炔丙基醇,得到相应的炔丙基甲基醚,在CuBr的催化下,它们可以与伯烷基格氏试剂反应,得到3-取代的1,2-丙烯或2-取代的仲2,3-烯醇分别。该反应可用于合成具有高达> 99%ee的旋光性2-取代的2,3-二级烯醇,而对起始4-羟基-2-炔基甲基醚中的游离羟基没有任何保护。