The Preparation of Organolithium Compounds by the Transmetalation Reaction. VII. cis- and trans-Propenyllithium: The Stereochemistry of the Transmetalation Reaction. Isopropenyllithium
Regio- and stereoselective addition of organolithiums to naphthalenes. an efficient synthesis of 11,2-trisubstituted and trans-2-disubstituted dihydronaphthalenes
作者:A.I. Meyers、Kathryn A. Lutomski、Dominique Laucher
DOI:10.1016/s0040-4020(01)85942-1
日期:1988.1
The addition of a variety of organolithium reagents to 1-napththyloxazolines and 2-naphthyloxazolines followed by trapping with electrophiles leads to high yields of the title compounds. Very high stereoselectivity characterizes the present process in that the electrophile enters from the naphthalene face opposite to the entry of the organolithium reagent. A number of organolithiums have been investigated
homokainoids in an enantiomerically pure form were synthesized from enantiopure (R)- and (S)-Garner's aldehyde, featuring (i) the highly diastereoselective addition of alkenylcuprates to the acrylate intermediates and (ii) the Rh-catalyzed cyclohydrocarbonylation of homoallylic amine intermediates to construct the functionalized piperidine moiety in the key steps. For the introduction of a substituent at the 4-
An Oxidative Prins-Pinacol Tandem Process and its Application to the synthesis of (−)-Platensimycin
作者:Marc-André Beaulieu、Cyrille Sabot、Nabil Achache、Kimiaka C. Guérard、Sylvain Canesi
DOI:10.1002/chem.201001813
日期:——
Center stage: An oxidative Prins–pinacol tandemprocess mediated by a hypervalent iodine reagent has been accomplished. The strategy allows rapid access to highly functionalized spirocyclic cores (see scheme) present in many natural products. A first application to the formal synthesis of (−)‐platensimycin has been achieved.
Total Synthesis of the Diterpenes (+)-Randainin D and (+)-Barekoxide via Photoredox-Catalyzed Deoxygenative Allylation
作者:Oleksandr Vyhivskyi、Olivier Baudoin
DOI:10.1021/jacs.4c02224
日期:——
We report the first enantioselective totalsynthesis of diterpenoid randainin D, which possesses a hydroazulenone core with a β-substituted butenolide moiety on the cycloheptane ring. The trans-5/7 ring system was formed via a highly challenging ring-closing metathesis delivering the tetrasubstituted cycloheptenone. The butenolide moiety was installed via a novel deoxygenative allylation under Ir-photoredox