Enantioselective Pd(II)-Catalyzed Intramolecular Oxidative 6-<i>endo</i> Aminoacetoxylation of Unactivated Alkenes
作者:Xiaoxu Qi、Chaohuang Chen、Chuanqi Hou、Liang Fu、Pinhong Chen、Guosheng Liu
DOI:10.1021/jacs.8b03767
日期:2018.6.20
A novel asymmetric 6-endo aminoacetoxylation of unactivatedalkenes by palladium catalysis, which yields chiral β-acetoxylated piperidines with excellent chemo-, regio- and enantioselectivities under very mild reaction conditions, has been established herein by employing a new designed pyridine-oxazoline (Pyox) ligand. Importantly, introducing a sterically bulky group into the C-6 position of Pyox
Enantioselective Synthesis of Pyrrolizidinone Scaffolds through Multiple-Relay Catalysis
作者:Marcos Escolano、Javier Torres Fernández、Fernando Rabasa-Alcañiz、María Sánchez-Roselló、Carlos del Pozo
DOI:10.1021/acs.orglett.0c03344
日期:2020.12.18
A triple-tandem protocol for the synthesis of the pyrrolizidinone skeleton has been devised. It involves a cross metathesis–intramolecular aza-Michael reaction–intramolecular Michael addition tandem sequence, starting from N-pentenyl-4-oxo-2-alkenamides and conjugatedketones. In the presence of two cooperative catalysts, namely the second-generation Hoveyda–Grubbs catalyst and (R)-TRIP-derived BINOL
Enantioselective Synthesis of Fluorinated Indolizidinone Derivatives
作者:Marcos Escolano、Daniel Gaviña、Santiago Díaz-Oltra、María Sánchez-Roselló、Carlos del Pozo
DOI:10.1021/acs.orglett.3c00903
日期:2023.5.12
The enantioselectivesynthesis of fluorinated indolizidinone derivatives has been developed. The process involved an enantioselective intramolecular aza-Michael reaction of conjugated amides bearing a pendant α,β-unsaturated ketone moiety, catalyzed by the (S)-TRIP-derived phosphoric acid, followed by dimethyltitanocene methylenation and ring closing metathesis (RCM). Final indolizidine-derived products
已经开发了氟化吲哚齐啶酮衍生物的对映体选择性合成。该过程涉及带有 α,β-不饱和酮侧基的共轭酰胺的对映选择性分子内氮杂-迈克尔反应,由 ( S )-TRIP 衍生的磷酸催化,然后是二甲基二茂钛亚甲基化和闭环复分解 (RCM)。最终的吲哚里西啶衍生产物包含由 RCM 反应生成的含氟四取代双键,这是一项具有挑战性的任务。整个合成序列以可接受的总产率和出色的对映体选择性进行。