A catalyst composed of an organic phosphorus compound having a trivalent or pentavalent phosphorus atom and at least one carbon-phosphorus bonding or a combination of the organic phosphorus compound and a halogen atom-containing compound is effective for decarbonylation, that is, for releasing carbon monoxide from a compound containing a moiety of -CO-CO-O- in its molecular structure.
Stereochemical Study of Puna’auic Acid, an Allenic Fatty Acid from the Eastern Indo-Pacific Cyanobacterium <i>Pseudanabaena</i> sp
作者:Emmanuel Roulland、Hiren Solanki、Kevin Calabro、Mayalen Zubia、Grégory Genta-Jouve、Olivier P. Thomas
DOI:10.1021/acs.orglett.8b00654
日期:2018.4.20
The isolation and structure elucidation of puna’auic acid, an allenic fatty acid isolated from a marine cyanobacterium, is described. All configurations were first assessed through molecular modeling of NMR and ECD spectra and then confirmed through a straightforward enantioselective total synthesis of puna’auic acid featuring a key reductive opening of a propargylic epoxide.
A readily accessible and bench-stable water-soluble hypervalent iodine(III) reagent (phenyliodonio)sulfamate (PISA) with an I–N bond was synthesized, and its structure was characterized by X-ray crystallography. With PISA, various indoles were synthesized via C–H amination of 2-alkenylanilines involving an aryl migration/intramolecular cyclization cascade with excellent regioselectivity in aqueous
a critical step affecting the efficiency of the NHC‐catalyzed γ‐butyrolactone formation via homoenolate addition to aryl aldehydes. A novel type of imidazolylidene catalyst with pendant alkoxy groups on the ortho‐N‐aryl groups is described. Catalyst of this sort facilitates the formation of the conjugated Breslow intermediate. Studies of the rate constants for homoenolate annulation affording γ‐butyrolactones
Microwave irradiation in organophosphorus chemistry. Part 2: Synthesis of phosphonium salts
作者:James J Kiddle
DOI:10.1016/s0040-4039(99)02288-1
日期:2000.2
domestic microwave oven. The microwave enhanced reaction of triphenylphosphine and an organic halide shows a remarkable rate acceleration under microwave irradiation and allows the general and facile synthesis of both stabilized and non-stabilized phosphonium salts.