One-Pot Tandem Diastereoselective and Enantioselective Synthesis of Functionalized Oxindole-Fused Spiropyrazolidine Frameworks
作者:Liang-Yong Mei、Xiang-Ying Tang、Min Shi
DOI:10.1002/chem.201403990
日期:2014.10.6
A highly efficient palladium(0)‐catalyzed asymmetric [3+2] cycloaddition using 3‐diazooxindoles serving as dipolarophiles affords functionalized pyrazolidinederivatives in an atom‐economical way. In addition, by trapping the pyrazolidinederivatives with maleimides, the corresponding spiropyrazolidine oxindoles containing multiple stereogenic centers have been obtained in high yields along with moderate
A Ni-catalyzed asymmetric ring-openingreaction of 2-substituted cyclopropane-1,1-dicarboxylates with aliphatic amines has been accomplished using the chiral indane-trisoxazoline (In-TOX) ligand. This highly enantioselective reaction provides an efficient approach to a variety of chiral γ-substituted γ-amino acid derivatives, which are readily transformed into multifunctionalized piperidines and γ-lactams
armory: The side‐arm‐modified In‐TOX/NiII complex was identified as a highly efficient and stereoselective catalyst for the [3+3] cycloaddition of aromaticazomethineimines with cyclopropanes (see picture). Density functional calculations and control experiments revealed that the directing effect of the side arm through π interactions is crucial to the stereochemical control.
设计军械库:侧臂修饰的In-TOX / Ni II复合物被认为是芳环三甲亚胺与环丙烷的[3 + 3]环加成反应的高效和立体选择性催化剂(参见图片)。密度泛函计算和控制实验表明,侧臂通过π相互作用的定向作用对于立体化学控制至关重要。