Chemo-Enzymatic Oxidative Rearrangement of Tertiary Allylic Alcohols: Synthetic Application and Integration into a Cascade Process
作者:Elisabetta Brenna、Michele Crotti、Matteo De Pieri、Francesco G. Gatti、Gabriele Manenti、Daniela Monti
DOI:10.1002/adsc.201800299
日期:2018.10.4
developed to easily transform a cyclopentenone derivative into trans‐Magnolione® and dehydro‐Magnolione®. The rearrangement of exocyclic allylic alcohols was tested as well, and a dynamic kinetic resolution was observed: α,β‐unsaturated ketones with (E)‐configuration and a high diastereomeric excess were synthesized. Finally, the 2,2,6,6‐tetramethyl‐1‐piperidinium tetrafluoroborate (TEMPO+BF4−)/laccase
Fulvene, metallocene catalysts and preparation method thereof, and preparation of polyolefines copolymer using the same
申请人:Park Young-Whan
公开号:US20050004385A1
公开(公告)日:2005-01-06
The present invention relates to a novel fulvene compound and a preparation method thereof, and more particularly to a fulvene compound having substituted groups in the 2- and 5-positions, prepared from an unsaturated ketone having a substituted group in the β-position and a halogen atom in the α-position, and a preparation method thereof. The present invention also relates to a metallocene catalyst having a substituted group in the α-position carbon of the bridge of the cyclopentadienyl group only by reaction of a fulvene compound and an anion group including the cyclopentadienyl group, and a preparation method of a polyolefin copolymer using the same.
Syntheses of Several Cyclopentano-Monoterpene Lactones Using 1,3-Dioxin Vinylogous Ester.
作者:Masashi OHBA、Tsuyoshi HANEISHI、Tozo FUJII
DOI:10.1248/cpb.43.26
日期:——
Formal syntheses of (±)-boschnialactone (5) and three cyclopentano-monoterpene lactones [i.e., (±)-iridomyrmecin (6), (±)-isoiridomyrmecin (7), and (±)-allodolicholactone (8)] have been accomplished in the form of the syntheses of 2-(methoxymethyl)-3-methyl-2-cyclopenten-1-one (11) and (±)-(4aα, 7α, 7aα)-hexahydro-7-methylcyclopenta[c]pyran-3(1H)-one (19), respectively, starting from 6, 7-dihydrocyclopenta-1, 3-dioxin-5(4H)-one (2). A synthesis of (±)-isodehydroiridomyrmecin (9) has also been achieved through a route including direct substitution of the hydroxy group of 2-(tert-butyldimethylsilyloxymethyl)-3-methyl-2-cyclopenten-1-ol (22) with 1-(tert-butyldimethylsilyloxy)-1-methoxyethene (23) as a key step.
Studies directed toward the synthesis of FS-2: observations on the fragmentation of cyclobutylcarbinyl radicals
作者:Frederick E Ziegler、Renata X Kover、Nathan N.K Yee
DOI:10.1016/s0040-4039(00)00810-8
日期:2000.7
toward a synthesis of the sesquiterpene FS-2 have permitted an investigation of the fragmentation of a cyclobutylcarbinylradical that preferentially cleaves to give the more stable of two possible radicals. This observation is contrasted with the results obtained in an analogous cyclobutyloxy radical fragmentation.
FULVENE, METALLOCENE CATALYSTS AND PREPARATION METHOD THEREOF, AND PREPARATION OF POLYOLEFINES COPOLYMER USING THE SAME
申请人:PARK Young-Whan
公开号:US20070185291A1
公开(公告)日:2007-08-09
The present invention relates to a novel fulvene compound and a preparation method thereof, and more particularly to a fulvene compound having substituted groups in the 2- and 5-positions, prepared from an unsaturated ketone having a substituted group in the β-position and a halogen atom in the α-position, and a preparation method thereof. The present invention also relates to a metallocene catalyst having a substituted group in the α-position carbon of the bridge of the cyclopentadienyl group only by reaction of a fulvene compound and an anion group including the cyclopentadienyl group, and a preparation method of a polyolefin copolymer using the same.