Stereoselective Synthesis of 5-(1-Hydroxyalkyl)-2-pyrrolidinones Utilizing Oxidation of 5-Alkylidene-2-pyrrolidinones to Acyliminium Ion Precursors
摘要:
A general method was devised for the LiN(TMS)(2)/AgOTf (=2:1)-catalyzed intramolecular (5-exo-dig) cyclization of beta -alkynylamides 1 possessing alkyl, aryl or no functional groups at the terminal alkynes, to 5-alkylidene-2-pyrrolidinones 2. These 5-alkylidene-2-pyrrolidinones were oxidized to the diol-type alkoxylactams 3 by dimethyldioxirane (DMD) or mCPBA in MeOH. These alkoxylactams are useful as tertiary N-acyliminium ion precursors for the synthesis of threo-5-(1-hydroxyalkyl)-2-pyrrolidinone derivatives 5. (C) 2000 Elsevier Science Ltd. All rights reserved.
Improved Synthesis of Various Isotope Labeled 4-Hydroxyalkenals and Peroxidation Intermediates
摘要:
A concise and isotope specific synthesis of perfluorobenzyl 5,5,6, 6-tetradeutero-9-oxononanoate and an abbreviated general multiisotope synthesis of 4-hydroxyalkenals is reported.
Silver-Catalyzed Enantioselective Propargylic C–H Bond Amination through Rational Ligand Design
作者:Minsoo Ju、Emily E. Zerull、Jessica M. Roberts、Minxue Huang、Ilia A. Guzei、Jennifer M. Schomaker
DOI:10.1021/jacs.0c05726
日期:2020.7.29
precursors from abundant C-H bonds. Herein, we report a regio- and enantioselectivesynthesis of -alkynyl -aminoalcohols via a silver-catalyzed propargylic C-H amination. The protocol was enabled by a new bis(oxazoline) (BOX) ligand designed via a rapid structure-activity relationship (SAR) analysis. The method utilizes accessible carbamateesters bearing -propargylic C-H bonds and furnishes versatile products
Improved Synthesis of Various Isotope Labeled 4-Hydroxyalkenals and Peroxidation Intermediates
作者:M. S. Rees、F. J.G.M. van Kuijk、A. N. Siakotos、B. P. Mundy
DOI:10.1080/00397919508015474
日期:1995.10
A concise and isotope specific synthesis of perfluorobenzyl 5,5,6, 6-tetradeutero-9-oxononanoate and an abbreviated general multiisotope synthesis of 4-hydroxyalkenals is reported.
Stereoselective Synthesis of 5-(1-Hydroxyalkyl)-2-pyrrolidinones Utilizing Oxidation of 5-Alkylidene-2-pyrrolidinones to Acyliminium Ion Precursors
A general method was devised for the LiN(TMS)(2)/AgOTf (=2:1)-catalyzed intramolecular (5-exo-dig) cyclization of beta -alkynylamides 1 possessing alkyl, aryl or no functional groups at the terminal alkynes, to 5-alkylidene-2-pyrrolidinones 2. These 5-alkylidene-2-pyrrolidinones were oxidized to the diol-type alkoxylactams 3 by dimethyldioxirane (DMD) or mCPBA in MeOH. These alkoxylactams are useful as tertiary N-acyliminium ion precursors for the synthesis of threo-5-(1-hydroxyalkyl)-2-pyrrolidinone derivatives 5. (C) 2000 Elsevier Science Ltd. All rights reserved.