Stereoselective synthesis of (.+-.)-indolizidines 167B, 205A, and 207A. Enantioselective synthesis of (-)-indolizidine 209B
作者:Andrew B. Holmes、Adrian L. Smith、Simon F. Williams、Leslie R. Hughes、Zev Lidert、Colin Swithenbank
DOI:10.1021/jo00004a012
日期:1991.2
The first syntheses of the dendrobatid indolizidine alkaloids 167B (3), 205A (4), and 207A (5) are described using as a key step the highly stereoselective intramolecular nitrone cycloaddition of the (Z)-N-alkenylnitrone 10 to prepare the isoxazolidine 11. Mesylate-promoted cyclization of the alcohol 12, followed by reductive cleavage of the resulting mesylate salt, afforded the key axial hydroxymethyl compound 13, which was epimerized via the aldehyde to the equatorial alcohol, and was subsequently reduced to the required 8-methyl-substituted indolizidine. The feasibility of extending this strategy to the enantioselective synthesis of such alkaloids was demonstrated in the first synthesis of (-)-indolizidine 209B (6), whose nitrone precursor 10d was obtained from the (S)-glutamate-derived amine 40.
Stereoselective synthesis of (.+-.)-indolizidines 167B, 205A, and 207A. Enantioselective synthesis of (-)-indolizidine 209B
作者:Adrian L. Smith、Simon F. Williams、Andrew B. Holmes、Leslie R. Hughes、Colin. Swithenbank、Zev. Lidert
DOI:10.1021/ja00234a021
日期:1988.12
Enantioselective Reductive <i>N</i>-Cyclization–Alkylation Reaction of Alkene-Tethered Oxime Esters and Alkyl Iodides by Nickel Catalysis
作者:Xue-Gong Jia、Qi-Wei Yao、Xing-Zhong Shu
DOI:10.1021/jacs.2c05523
日期:2022.8.3
N-cyclization–alkylation reaction and thus showcase the potential of heterocyclization for accessing new enantioenriched cyclic architectures. This work establishes a newapproach for enantioselective aza-Heck cyclization/cross-coupling sequence, which remains a long-standing unsolved challenge for the synthetic community. The reaction proceeds with primary, secondary, and a few tertiary alkyl iodides, and