Synthesis of Phthalide Derivatives Using Nickel-Catalyzed Cyclization ofo-Haloesters with Aldehydes
作者:Dinesh Kumar Rayabarapu、Hong-Tai Chang、Chien-Hong Cheng
DOI:10.1002/chem.200305740
日期:2004.6.21
aliphatic aldehydes (2 b, 4-MeC(6)H(4)CHO; 2 c, 4-MeOC(6)H(4)CHO; 2 d, 3-MeOC(6)H(4)CHO; 2 e, 2-MeOC(6)H(4)CHO; 2 f, 4-CNC(6)H(4)CHO; 2 g, 4-(Me)(3)CC(6)H(4)CHO; 2 h, 4-C(6)H(5)C(6)H(4)CHO; 2 i, 4-ClC(6)H(4)CHO; 2 j, 4-CF(3)C(6)H(4)CHO; 2 k, CH(3)(CH(2))(5)CHO; 2 l, CH(3)(CH(2))(2)CHO) also underwent cyclization with o-bromobenzoate (1 b) producing the corresponding phthalide derivatives in moderate
在[NiBr(2)(dppe)](dppe = 1,2-双(二苯基膦基)乙烷)和锌粉存在下,邻溴苯甲酸酯(1 b)与苯甲醛(2 a)在THF中反应(24小时(回流温度),以86%的收率得到3-苯基-3H-异苯并呋喃-1-酮(3a)。类似地,邻碘苯甲酸酯与2a反应生成3a,但产率较低(50%)。一系列取代的芳香族和脂肪族醛(2 b,4-MeC(6)H(4)CHO; 2 c,4-MeOC(6)H(4)CHO; 2 d,3-MeOC(6)H( 4)CHO; 2 e,2-MeOC(6)H(4)CHO; 2 f,4-CNC(6)H(4)CHO; 2 g,4-(Me)(3)CC(6)H (4)CHO; 2 h,4-C(6)H(5)C(6)H(4)CHO; 2 i,4-ClC(6)H(4)CHO; 2 j,4-CF( 3)C(6)H(4)CHO; 2 k,CH(3)(CH(2))(5)CHO; 2 l,