Synthesis and Stereochemistry of Some Bicyclic γ-Lactones from Parasitic Wasps (Hymenoptera: Braconidae). Utility of Hydrolytic Kinetic Resolution of Epoxides and Palladium(II)-Catalyzed Hydroxycyclization−Carbonylation−Lactonization of Ene-diols
作者:Gregory C. Paddon-Jones、Christopher S. P. McErlean、Patricia Hayes、Christopher J. Moore、Wilfried A. Konig、William Kitching
DOI:10.1021/jo0159237
日期:2001.11.1
A palladium(II)-catalyzed hydroxycyclization-carbonylation-lactonization sequence with appropriate pent-4-ene-1,3-diols provides efficient access to the bicyclic gamma-lactones, 5-n-butyl- and 5-n-hexyltetrahydrofuro-[3,2-b]furan-2(3H)-ones (3) and (4), respectively, in both racemic and enantiomeric forms. Some of the substrate pent-4-ene-1,3-diols of high enantiomeric excess (ee) have been derived
Continuous Pd-Catalyzed Carbonylative Cyclization Using Iron Pentacarbonyl as a CO Source
作者:Pavol Lopatka、Martin Markovič、Peter Koóš、Steven V. Ley、Tibor Gracza
DOI:10.1021/acs.joc.9b02453
日期:2019.11.15
continuous flowcarbonylationreaction using iron pentacarbonyl as source of CO. The described transformation using this surrogate was designed for use in commonly accessible flow equipment. Optimized conditions were applied to a scalable synthesis of the natural compound isolated from perianal glandular pheromone secretion of the African civet cat. In addition, a flowPd-catalyzedcarbonylation of aryl
A concise synthesis of Hagen's gland lactones 3–6 by a chiron approach starting fromd-mannose is described. Transformation of d-mannose to dihydroxy-vinylfuran 8 followed by Pd(II)Cl2 mediated oxidative cyclisation to obtain the tetrahydrofurofuran diol 7 constituted the key reaction in the totalsynthesis of 3–6.
A Protecting-Group-Free Synthesis of Hagen’s Gland Lactones
作者:Rodney A. Fernandes、Pullaiah Kattanguru
DOI:10.1021/jo301465z
日期:2012.10.19
A practical protecting group free synthesis of Hagen's gland lactones 1 and 2 is accomplished in four steps and 25.6 and 37.4% overall yields, respectively. The strategy relies on a one-pot conversion of D-glucono-delta-lactone to beta-hydroxy-gamma-vinyl-gamma-lactone, cross-metathesis, and iodocyclization-deiodinization as key steps.