Rhodium-Catalyzed Intramolecular Hydroacylation of 5- and 6-Alkynals: Convenient Synthesis of ?-Alkylidenecycloalkanones and Cycloalkenones
作者:Kenzo Takeishi、Koudai Sugishima、Kaori Sasaki、Ken Tanaka
DOI:10.1002/chem.200400679
日期:2004.11.19
novel intramolecular hydroacylation of 5- and 6-alkynals leading to alpha-alkylidenecycloalkanones was accomplished by using cationic a rhodium(I)/BINAP complex. For all cyclizations described, a single (E)-olefin isomer was obtained. At elevated temperature, hydroacylation and double bond migration of 5- and 6-alkynals proceeded in a one-pot reaction to give cycloalkenones. An intramolecular hydroacylation
通过使用阳离子铑(I)/ BINAP络合物完成了5-和6-炔基的新型分子内加氢酰化反应,生成α-亚烷基环烷酮。对于所述的所有环化,均获得了单一的(E)-烯烃异构体。在升高的温度下,一锅反应进行5-和6-炔烃的加氢酰化和双键迁移,得到环烯酮。7-炔烃的分子内加氢酰化是不成功的。该方法代表了一种引人注目的新途径,以制备高度官能化的α-亚烷基环链烷酮和环烯酮。