Arabinopyranoside methyl 3,4-0-ethylidene

Scheme 14.—Proposed Mechanism for Photochemical Reaction of Methyl 3,4-0 Ethylidene-/3-L-arabinopyranoside (35) with Excited Acetone.

Hydrogenolysis of cyclic orthoesters with diborane (a method using lithium aluminum hydride-aluminum chloride had been described for 1,2-orthoesters37) has been shown to be a route to cyclic acetals38 thus, a mixture of the endo and exo isomers of methyl 3,4-0-(ethoxy-ethylidene)-/3-L-arabinopyranoside led to methyl endo-3,4-0-ethy]i-dene-/3-L-arabinopyranoside (yield 66%). 

Methyl /S-L-arabinopyranoside furnishes a crystalline 3,4-0-ethylidene acetal which gives, after benzoylation, a 2-benzoate, m.p. 141-142°. From... 

O-Ethylidene Methyl 3,4-O-ethyli-dene-p-L-arabinopyranoside CgHnO, 190.196... 

Methyl 5-amino-l,3-0-benzylidene-5-deoxy-a-L-sorbopyranoside, A-336 Methyl 3-amino-3-deoxy-p-D-allofuranoside, A-157 Methyl 3-amino-3-deoxy-a-D-allopyranoside, A-157 Methyl 3-amino-3-deoxy-p-D-allopyranoside, A-157 Methyl 3-amino-3-deoxy-D-alluronate, A-160 Methyl 3-amino-3-deoxy-a-D-altropyranoside, A-165 Methyl 2-amino-2-deoxy-a-D-arabinopyranoside, A-178 Methyl 2-amino-2-deoxy-p-D-arabinopyranoside, A-178 Methyl 4-amino-4-deoxy-a-D-arabinopyranoside, A-179 Methyl 4-amino-4-deoxy-a-L-arabinopyranoside, A-179 Methyl 4-amino-4-deoxy-p-L-arabinopyranoside, A-179 Methyl 2-amino-2-deoxy-4,6-0-ethylidene-3-0-inethyl-a-D-glucopyranoside, M-150... 

Methyl 5-ethenyl-2,2-dimethyl-l,3-dioxolane-4-carboxylate, D-708 Methyl (ethyl 2,3,4-tri-0-benzyl-l-thio-p-D-glucopyranosid)uronate, T-75 Methyl 3,4-0-ethylidene-p-L-arabinopyranoside, M-153 Methyl 4,6-0-ethylidene-2,3-di-0-metiiyl-p-D-galactopyranoside, M-186 Methyl 4,6-0-ethylidene-2,3-di-0-methyl-a-D-niannopyranoside, M-180 Methyl 4,6-0-ethylidene-2,3-di-0-tosyl-a-D-glucopyranoside, M-190 Methyl 4,6-0-ethylidene-2,3-di-0-tosyl-a-D-mannopyranoside, M-180 Methyl 4,6-O-ethylidene-a-D-galactopyranoside, M-185 Methyl 3,4-O-ethylidene-p-D-galactopyranoside, M-186 Methyl 4,6-O-ethylidene-a-D-glucopyranoside, M-190 Methyl 4,6-0-ethylidenemannopyranoside, M-180 Methyl 4,6-0-ethylidene-2-0-methyl-a-D-altropyranoside, M-149 Methyl 4,6- O -ethylidene-2-0 -methyl-a-D-arafeiwo -hexopyranosid-3-ulose, H-95... 

Methyl 2-0-benzoyl-a-D-arabinofiiraiioside, M-152 Methyl 2-0-benzoyl-3-0-benzyl-a-i>ajabmofiiraiioside, M-152 Methyl 2-0-benzoyl-3,4-0-benzylidene-p-L-ajabinopyraiioside, M-153 Methyl 5-0-benzoyl-3-bromo-3-deoxy-p-i>arabmofiiranoside, B-63 Methyl 5-0-benzoyl-3-deoxy-3-iodo-a-i>ajabmofiiranoside, D-250 Methyl 4-0-benzoyl-2-deoxy-2-iodo-p-L-arabinopyranoside, D-249 Methyl 2-0-benzoyl-3,4-0-ethylidene-p-L-arabinopyranoside, M-153 Methyl 2-0-benzoyl-3,4-0-isopropylidene-p-L-ajabinopyraiioside, M-197 Methyl 2-O-benzyl-p-D-arabmofuranoside, M-152 Methyl 2-0-benzyl-p-L-arabinopyranoside, M-153 Methyl 3,4-O-benzylidene-p-L-arabinopyranoside, M-153 Methyl 3,4-0-benzylidene-2-0-tosyl-p-L-arabinopyranoside, M-153 Methyl 2-0-benzyl-3,4-0-isopropylidene-p-L-ajabinopyranoside, M-197 Methyl 2-bromo-2-deoxy- -D-arabinopyranoside, B-62 Methyl 3-bromo-3-deoxy-P-D-arabinopyranoside, B-63 Methyl 2-chloro-2-deoxy-a-D-arabinofuranoside, C-74 Methyl 2-chloro-2-deoxy-P-D-arabinofuranoside, C-74 Methyl 4-chloro-4-deoxy-P-D-arabinopyranoside, C-75 Methyl 3,5-di-0-acetyl-2-bromo-2-deoxy-a-D-arabinofuranoside, B-62 Methyl 3,5-di-0-acetyl-2-bromo-2-deoxy-P-D-arabinofuranoside, B-62 Methyl 3,5-di-0-acetyl-2-chloro-2-deoxy-a-D-arabinofuranoside, C-74 Methyl 3,5-di-0-acetyl-2-chloro-2-deoxy-P-D-arabinofuranoside, C-74 Methyl 3.4-di-0-acetyl-2-chloro-2-deoxy-a-D-arabinopyranoside, C-74 Methyl 3,4-di-0-acetyl-2-deoxy-2-iodo-a-D-arabinopyranoside, D-249 Methyl 3,4-di-0-acetyl-2-deoxy-2-iodo-a-L-arabinopyranoside, D-249 Methyl 3,5-di-0-acetyl-2-0-methyl-a-D-arabinofuranoside, M-152 Methyl 3,5-di-0-acetyl-2-0-methyl-p-D-arabinofuranoside, M-152 Methyl 3,4-di-0-acetyl-2-0-methyl-p-L-arabinopyranoside, M-153 Methyl 2,3-di-0-acetyl-4-0-methyl-a-DL-arabinopyranoside, M-153 Methyl 2,3-di-O-benzoyl-p-L-arabinopyranoside, M-153 Methyl 3,5-di-0-benzoyl-2-bromo-2-deoxy-p-D-arabinofuranoside, B-62 Methyl 2,4-di-0-benzoyl-3-bromo-3-deoxy-p-D-arabinopyranoside, B-63 Methyl 2,3-di-0-benzoyl-5-0-tosyl-a-L-arabinofuranoside, M-152 Methyl 2,3-di-O-benzyl-a-L-arabinofuranoside, M-152 Methyl 2,3-di-O-benzyl-P-L-arabinofuranoside, M-152 Methyl 3,5-di-0-benzyl-2-chloro-2-deoxy-a-D-arabinofuranoside, C-74 Methyl 3,4-di-0-benzyl-2-deoxy-2-C-(tosylcarbamoyl)-a-L-arabinopyranoside, C-8... 

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