Evaluation of Enantiopure <i>N</i>-(Ferrocenylmethyl)azetidin-2-yl(diphenyl)methanol for Catalytic Asymmetric Addition of Organozinc Reagents to Aldehydes
作者:Min-Can Wang、Qing-Jian Zhang、Wen-Xian Zhao、Xiao-Dan Wang、Xue Ding、Tao-Tao Jing、Mao-Ping Song
DOI:10.1021/jo701943x
日期:2008.1.1
catalytic asymmetric addition of organozinc reagents to aldehydes. The asymmetric ethylation, methylation, arylation, and alkynylation of aldehydes achieved enantioselectivity of up to 98.4%, 94.1%, 99.0%, and 84.6% ee, respectively, in the presence of a catalytic amount of chiral N-(ferrocenylmethyl)azetidin-2-yl(diphenyl)methanol. Our results demonstrated further that the four-membered heterocycle-based
described. This development allowed the asymmetric nickel-catalyzed 1,2-addition of arylboronreagents to aromatic aldehydes. The enantioselectivity is synthetically acceptable (up to 81% ee) using 1-naphthaldehyde and 2-substituted aromatic aldehydes as substrates. The results have enantioselectivity comparable to the best results reported by us for the rhodium-catalyzed arylation of aromatic aldehydes.
Synthesis of Ar-BINMOL Ligands by [1,2]-Wittig Rearrangement to Probe Their Catalytic Activity in 1,2-Addition Reactions of Aldehydes with Grignard Reagents
demonstrates a unique cascade chirality transfer in a [1,2]-Wittig rearrangement that leads to chiral diols with three stereogenic centers, which include a chiral sp 3 center at the alcohol and C 2 -axial chirality. Screening these ligands in the arylation of aromaticaldehydes with Grignard reagents shows that the naphthyl-substituted BINMOL promotes the aryltransferreaction in good yields (70-92%) and moderate-to-good
Design and Synthesis of Tunable Chiral 2,2′‐Bipyridine Ligands: Application to the Enantioselective Nickel‐Catalyzed Reductive Arylation of Aldehydes
作者:Shuai Zhang、Saima Perveen、Yizhao Ouyang、Liang Xu、Tao Yu、Min Zhao、Linghua Wang、Peidong Song、Pengfei Li
DOI:10.1002/anie.202117843
日期:2022.5.9
A tunable chiral2,2′-bipyridine scaffold SBpy was rationally designed and enabled a general and highly enantioselective Ni-catalyzed addition of aryl halides to aldehydes. This approach is more step-economic than conventional strategies and allowed the preparation of various diaryl carbinols without the need to use preformed metallic reagents.
合理设计了一种可调节的手性 2,2'-联吡啶支架 SBpy,并能够在 Ni 催化下将芳基卤化物与醛类进行通用且高度对映选择性的加成。这种方法比传统策略更经济,并且无需使用预制金属试剂即可制备各种二芳基甲醇。