Asymmetric Dearomatization of the Furan Ring Promoted by Conjugate Organolithium Addition to (Menthyloxy)(3-furyl)carbene Complexes of Chromium
作者:José Barluenga、Sandip K. Nandy、Y. R. Santosh Laxmi、José Ramón Suárez、Isabel Merino、Josefa Flórez、Santiago García-Granda、José Montejo-Bernardo
DOI:10.1002/chem.200305241
日期:2003.12.5
sequential low-temperature addition reaction of an organolithium compound and methyl triflate to (menthyloxy)(3-furyl)carbene complexes of chromium and tungsten proceeded with excellent regioselectivity (1,4-addition) and diastereoselectivity (2,3-trans disposition of the nucleophile and electrophile groups) to afford new 2,3-disubstituted (2,3-dihydro-3-furyl)carbene complexes. In addition, a high degree of
有机锂化合物和三氟甲磺酸甲酯与铬和钨的(薄荷基氧基)(3-呋喃基)卡宾络合物的顺序低温加成反应以优异的区域选择性(1,4-加成)和非对映选择性(2,3-反式处置)进行亲核基团和亲电基团)得到新的2,3-二取代的(2,3-二氢-3-呋喃基)卡宾配合物。另外,通过使用烯基锂化合物实现了高度的非对映选择性。分离金属片段和手性辅助基团后,获得在C3位上含有季立体位中心的三取代的2,3-二氢呋喃衍生物。表征,包括X射线晶体学,