3,3-双(2,4,6-三异丙基苯基)-1,1-联萘基-2,2-二基磷酸氢盐(TRIP)催化有机基锌不对称烯丙基化的底物范围已扩展到非环酯有机锌试剂和酮。获得的手性叔醇的 ee 高达 94%,并且可以创建两个立体中心。与之前的内酯试剂相比,立体偏好几乎完全转变,证明有机金属化合物的性质对于产物的不对称性非常重要。
Asymmetric synthesis of diversely substituted N-hydroxypyrrolidines using cycloadditions with chiral nitrone enolate/ylids
作者:Stephen Hanessian、Malken Bayrakdarian
DOI:10.1016/s0040-4039(01)02305-x
日期:2002.2
A stereoselective synthesis of diversely substituted N-hydroxypyrrolidines is reported, based on the cycloaddition reaction of chiral non-racemic nitrone ylids with a variety of α,β-unsaturated esters.
A Selenourea-Thiourea Brønsted Acid Catalyst Facilitates Asymmetric Conjugate Additions of Amines to α,β-Unsaturated Esters
作者:Yingfu Lin、William J. Hirschi、Anuj Kunadia、Anirudra Paul、Ion Ghiviriga、Khalil A. Abboud、Rachael W. Karugu、Mathew J. Vetticatt、Jennifer S. Hirschi、Daniel Seidel
DOI:10.1021/jacs.9b12457
日期:2020.3.25
enantioselectivity via the conjugate addition of cyclic amines to unactivated α,β-unsaturated esters. A related strategy enables the kineticresolution of racemic cyclic 2-arylamines, using benzyl acrylate as the resolving agent. Reactions are facilitated by an unprecedented selenourea-thiourea organocatalyst. As elucidated by DFT calculations and 13C kinetic isotope effects studies, the rate-limiting and enantiodetermining
Enantioselective Synthesis of Polycyclic Indole Derivatives Based on aza-Morita–Baylis–Hillman Reaction
作者:Yuning Gao、Qin Xu、Min Shi
DOI:10.1021/acscatal.5b01579
日期:2015.11.6
A chiral phosphine-catalyzed asymmetric aza-Morita–Baylis–Hillmanreaction between indole-derived sulfonyl imines and bis(3-chlorophenyl)methyl acrylate has been developed, giving the desired adducts in good yields and enantiomeric excess values along with the further transformations to polycyclic indoles such as dihydropyrido[1,2-a]indole and dihydropyrazino[1,2-a]indole skeleton.
已开发出吲哚衍生的磺酰基亚胺与丙烯酸双(3-氯苯基)甲酯之间的手性膦催化的不对称氮杂-Morita-Baylis-Hillman反应,得到所需的加合物,具有良好的收率和对映体过量值,并进一步转化为多环吲哚,例如二氢吡啶并[1,2- a ]吲哚和二氢吡嗪并[1,2- a ]吲哚骨架。
Rhodium-Catalyzed Redox-Neutral Olefination of Aryldiazenes with Acrylate Esters via C–H Activation and Transfer Hydrogenation
作者:Xiaofei Zhang、Bin Zhang、Xingwei Li
DOI:10.1021/acs.orglett.1c00107
日期:2021.3.5
Rh(III)-catalyzed redox-neutral C–H olefination of aryldiazenecarboxylates has been realized using arylate esters as the olefinating reagents. This reaction proceeds under mild and redox-neutral conditions, resulting in integration of C–Hactivation and transferhydrogenation. The chemoselectivity complements that of previously reported rhodium-catalyzed coupling of the same substrates.
Herein, a series of indenone structures containing the SCF3 group and an adjacent chiral quaternary stereocenter were synthesized by an asymmetric Michael addition reaction using an ion pair catalyst derivedfrom amino acids. The desired products were obtained in excellent yields (up to 98%) and good to high stereoselectivities (up to 97% ee and >20:1 dr).