2014
DOI: 10.1002/anie.201408739
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Reversing the Stereoselectivity of a Palladium‐Catalyzed O‐Glycosylation through an Inner‐Sphere or Outer‐Sphere Pathway

Abstract: An efficient and concise method for the construction of various O-glycosidic bonds by a palladium-catalyzed reaction with a 3-O-picoloyl glucal has been developed. The stereochemistry of the anomeric center derives from either an inner-sphere or outer-sphere pathway. Harder nucleophiles, such as aliphatic alcohols and sodium phenoxides give β-products, and α products result from using softer nucleophiles, such as phenol.

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Cited by 52 publications
(29 citation statements)
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“…Previously, the application of this technique to glycosidic bond formation has been hampered by the difficulty in the formation of the palladium π-allyl intermediates and their poor reactivity in the electron-rich glycal systems [ 120 ]. To overcome this challenge the Liu group explored the application of palladium π-allyl intermediates to O -glycosylation through the use of a picoloyl group to direct palladium binding at the C-3 position [ 121 ]. Glycosylation results are indicative of two reaction pathways with differing in the selectivity outcome based on the hard/soft properties of the nucleophiles.…”
Section: Reviewmentioning
confidence: 99%
“…Previously, the application of this technique to glycosidic bond formation has been hampered by the difficulty in the formation of the palladium π-allyl intermediates and their poor reactivity in the electron-rich glycal systems [ 120 ]. To overcome this challenge the Liu group explored the application of palladium π-allyl intermediates to O -glycosylation through the use of a picoloyl group to direct palladium binding at the C-3 position [ 121 ]. Glycosylation results are indicative of two reaction pathways with differing in the selectivity outcome based on the hard/soft properties of the nucleophiles.…”
Section: Reviewmentioning
confidence: 99%
“…However, the polyols that can be effectively targeted in such reaction sequences are limited because most polyols are not sufficiently soluble in organic solvents. This problem is of central importance in carbohydrate chemistry, where solubility and regioselectivity is the major obstacle to the preparation of advanced compounds from readily available saccharide derivatives . Furthermore, these catalyst driven reactions also possess troublesome shortcomings including their inherent toxicity and the high cost of catalysts and the necessity to pre‐protect secondary hydroxyl groups.…”
Section: Introductionmentioning
confidence: 99%
“…287 Accordingly, a variety of O -glycosidation methods, 288, 289 using the Pd-catalyzed Tsuji-Trost allylic alkylation were developed to link monosaccharides. 290-294 These methods involved the work of Lee, 295, 296 Feringa, 146 O'Doherty, 81, 145 Liu, 297-299 and Rhee. 300 …”
Section: Introductionmentioning
confidence: 99%
“…302 Mezzettiaside-2 ( 271 ) and congeners were synthesized as anticancer/antibiotic oligosaccharides. 88 Merremoside D 272 299 and carbohydrates including digitoxin ( 273 , anticancer properties), 303 vineomycinone B2 ( 274 ), 304 vineomycin B2 trisaccharide ( 276 ) 305 (antitumor and antibacterial activities), methymycin analogues such as 275 (antibiotic activity), 306 and landomycins A and E ( 277a,b , antitumor activity) 307 were also synthesized using these protocols.…”
Section: Introductionmentioning
confidence: 99%