Chiral Phosphoric Acid Catalyzed Enantioselective [4 + 2] Cycloaddition Reaction of α-Fluorostyrenes with Imines
作者:Jun Kikuchi、Haiting Ye、Masahiro Terada
DOI:10.1021/acs.orglett.0c03360
日期:2020.11.20
An enantioselective [4 + 2] cycloadditionreaction of α-fluorostyrenes with N-benzoyl imines was demonstrated using a chiral phosphoric acid catalyst. Cycloaddition products having fluorine functionality were formed in high yields with excellent diastereo- and enantioselectivities. Further manipulation of the enantioenriched cycloaddition product with silyl enol ether in the presence of BiCl3 catalyst
使用手性磷酸催化剂证明了α-氟苯乙烯与N-苯甲酰基亚胺的对映选择性[4 + 2]环加成反应。具有氟官能团的环加成产物以高收率形成,具有优异的非对映选择性和对映选择性。在BiCl 3催化剂存在下,用甲硅烷基烯醇醚进一步处理对映体富集的环加成产物,得到的取代产物可通过选择性碳-氟键裂解保留二氢-4 H -1,3-恶嗪骨架,而不会损失对映体过量。
Modular Synthesis of Tetrasubstituted Imidazoles and Trisubstituted Oxazoles by Aldimine Cross-Coupling
作者:Coralie Kison、Till Opatz
DOI:10.1002/chem.200802175
日期:2009.1.12
From five to two: The addition of deprotonated Strecker products to N‐acylimines permits the synthesis of tetrasubstituted imidazoles or trisubstituted oxazoles in three or four steps, respectively. In total, the target compounds are prepared from two aldehydes, a primary amine, an acid chloride and ammonia (see scheme).
Highly enantioselective allylic amination reaction through aerobic oxidative organo–organo dual catalytic system
作者:Chengli Mou、Guangping Liang、Peiyao Liang、Siyi Chen、Chong Wu、Shenghan Teng、Shoulei Wang
DOI:10.1039/d4nj00478g
日期:2024.4.2
substituted imides were facilely synthesized through aerobic oxidation/allylic amination reactions of aldimines with MBH carbonates under N-heterocyclic carbene (NHC)/chiral tertiary amine dual catalysis. The strategy is attractive and valuable because of the convenient one-step procedure, environmental friendliness, high enantioselectivity and good functional-group tolerance.
Chiral Phosphoric Acid Catalyzed Addition of Dihydropyrans to <i>N</i>-Acyl Imines: Stereocontrolled Access to Enantioenriched Spirocyclic Oxazoletetrahydropyrans with Three Contiguous Stereocenters
作者:Guilong Li、Matthew J. Kaplan、Lukasz Wojtas、Jon C. Antilla
DOI:10.1021/ol100378t
日期:2010.5.7
Dihydropyran derivatives readily undergo addition to N-acyl imines in the presence of chiral phosphoric acids. This addition process yields an attractive product that is capable of a tandem oxidative-cyclization via an epoxide intermediate.