1394311-32-0Relevant articles and documents
Cation clock reactions for the determination of relative reaction kinetics in glycosylation reactions: Applications to gluco- and mannopyranosyl sulfoxide and trichloroacetimidate type donors
Adero, Philip O.,Furukawa, Takayuki,Huang, Min,Mukherjee, Debaraj,Retailleau, Pascal,Boh, Luis,Crich, David
supporting information, p. 10336 - 10345 (2015/09/01)
The development of a cation clock method based on the intramolecular Sakurai reaction for probing the concentration dependence of the nucleophile in glycosylation reactions is described. The method is developed for the sulfoxide and trichloroacetimidate glycosylation protocols. The method reveals that O-glycosylation reactions have stronger concentration dependencies than C-glycosylation reactions consistent with a more associative, SN2-like character. For the 4,6-O-benzylidene-directed mannosylation reaction a significant difference in concentration dependence is found for the formation of the β- and α-anomers, suggesting a difference in mechanism and a rationale for the optimization of selectivity regardless of the type of donor employed. In the mannose series the cyclization reaction employed as clock results in the formation of cis and trans-fused oxabicyclo[4,4,0]decanes as products with the latter being strongly indicative of the involvement of a conformationally mobile transient glycosyl oxocarbenium ion. With identical protecting group arrays cyclization in the glucopyranose series is more rapid than in the mannopyranose manifold. The potential application of related clock reactions in other carbenium ion-based branches of organic synthesis is considered.
Cation clock permits distinction between the mechanisms of α- And β-O- and β-C-glycosylation in the mannopyranose series: Evidence for the existence of a mannopyranosyl oxocarbenium ion
Huang, Min,Retailleau, Pascal,Bohe, Luis,Crich, David
supporting information, p. 14746 - 14749,4 (2012/12/11)
The use of a cationic cyclization reaction as a probe of the glycosylation mechanism has been developed and applied to the 4,6-O-benzylidene-protected mannopyranoside system. Cyclization results in the formation of both cis- and trans-fused tricyclic syst
Cation clock permits distinction between the mechanisms of α- And β-O- and β-C-glycosylation in the mannopyranose series: Evidence for the existence of a mannopyranosyl oxocarbenium ion
Huang, Min,Retailleau, Pascal,Bohe, Luis,Crich, David
supporting information, p. 14746 - 14749 (2013/01/14)
The use of a cationic cyclization reaction as a probe of the glycosylation mechanism has been developed and applied to the 4,6-O-benzylidene-protected mannopyranoside system. Cyclization results in the formation of both cis- and trans-fused tricyclic syst
