79528-53-3

Upstream product

• 79528-52-2 2-((4aR,6S,7R,8R,8aS)-8-Benzyloxy-2-phenyl-6-phenylsulfanyl-hexahydro-pyrano[3,2-d][1,3]dioxin-7-yl)-isoindole-1,3-dione 
• 208644-70-6 phenyl 3-O-benzyl-4,6-O-benzylidene-2-deoxy-2-phthalimido-1-thio-β-D-glucopyranoside 
• 79528-49-7 phenyl 3,4,6-tri-O-acetyl-2-deoxy-2-phthalimido-1-thio-β-D-glucopyranoside 
• 79528-51-1 phenyl 4,6-benzylidene-2-deoxy-2-deoxy-2-phthalimido-1-thio-β-D-glucopyranoside 
• 136882-36-5 2-((2S,3R,4R,5S,6R)-4,5-Dihydroxy-6-hydroxymethyl-2-phenylsulfanyl-tetrahydro-pyran-3-yl)-isoindole-1,3-dione 
• 17314-33-9 tributyltin phenyl sulfide 
• 10022-13-6 1,3,4,6-tetra-O-acetyl-2-deoxy-2-phthalimido-β-D-glucopyranose 

Downstream Products

• 177421-18-0 Methyl O-{2,4,6-tri-O-acetyl-3-O-[(S)-1-(methoxycarbonyl)ethyl]-β-D-galactopyranosyl}-(1->4)-O-(3-O-benzyl-2-deoxy-2-phthalimido-β-D-glucopyranosyl)-(1->3)-2,4,6-tri-O-benzyl-β-D-galactopyranoside 
• 177421-14-6 Chloro-acetic acid (2R,3S,4R,5R,6S)-4-benzyloxy-6-((2R,3S,4S,5R,6R)-3,5-bis-benzyloxy-2-benzyloxymethyl-6-methoxy-tetrahydro-pyran-4-yloxy)-2-(2-chloro-acetoxymethyl)-5-(1,3-dioxo-1,3-dihydro-isoindol-2-yl)-tetrahydro-pyran-3-yl ester 
• 177421-16-8 Chloro-acetic acid (2R,3S,4R,5R,6S)-4-benzyloxy-6-((2R,3S,4S,5R,6R)-3,5-bis-benzyloxy-2-benzyloxymethyl-6-methoxy-tetrahydro-pyran-4-yloxy)-5-(1,3-dioxo-1,3-dihydro-isoindol-2-yl)-3-hydroxy-tetrahydro-pyran-2-ylmethyl ester 
• 177421-15-7 2-[(2S,3R,4R,5S,6R)-4-Benzyloxy-2-((2R,3S,4S,5R,6R)-3,5-bis-benzyloxy-2-benzyloxymethyl-6-methoxy-tetrahydro-pyran-4-yloxy)-5-hydroxy-6-hydroxymethyl-tetrahydro-pyran-3-yl]-isoindole-1,3-dione 
• 177421-17-9 Methyl O-{2,4,6-tri-O-acetyl-3-O-[(S)-1-(methoxycarbonyl)ethyl]-β-D-galactopyranosyl}-(1->4)-O-(3-O-benzyl-6-O-chloroacetyl-2-deoxy-2-phthalimido-β-D-glucopyranosyl)-(1->3)-2,4,6-tri-O-benzyl-β-D-galactopyranoside 
• 177421-13-5 Phenyl 3-O-benzyl-4,6-di-O-chloroacetyl-2-deoxy-2-phthalimido-1-thio-β-D-glucopyranoside 
• 79528-55-5 phenyl 6-O-benzoyl-3-O-benzyl-2-deoxy-2-phthalimido-1-thio-β-D-glucopyranoside 
• 79528-54-4 phenyl 6-O-acetyl-3-O-benzyl-2-deoxy-2-phthalimido-1-thio-β-D-glucopyranoside 

Relevant academic research and scientific papers

The Origin of High Stereoselectivity in Di-tert-butylsilylene-Directed α-Galactosylation

The origin of the high α(1,2-cis)-stereoselectivity in the reaction of galactosyl and galactosaminyl donors with a di-tert-butylsilylene (DTBS) group with several nucleophiles has been elucidated by means of experimental and computational approaches. DTBS overcomes any other cyclic protecting groups examined to date and the β(1,2-trans)-directing effect due to the neighboring participation by CO groups at C2. Requirements for the α(1,2-cis)-stereoselectivity are as follows: (1) generation of an oxocarbenium ion; (2) a galacto-type glycosyl donor with a cyclic protecting group bridging O4 and O6 to form a six-membered ring; (3) through-space electron donation from O4 and O6 into the empty p-orbital of the anomeric carbon to stabilize the oxocarbenium intermediate; (4) steric hindrance due to bulky alkyl substituents on the cyclic protecting group to prevent nucleophilic attack from the β-face; and (5) a 4,6-O-silylene structure. Furthermore, it was found that the strong stereodirecting effect of the DTBS group was unique and specific among the various cyclic protecting groups examined.