Repeat steps 2 to 4 as needed to elongate the carbon chain further. This may involve the oxidation of another hydroxyl group, followed by another round of carbonyl allylation.
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(R)-1-((4S,6R)-6-(2-(benzyloxy)ethyl)-2,2-dimethyl-1,3-dioxan-4-yl)pent-4-en-2-ol
Fmoc-Asp(OBn)-Ala-OH
Pyridine
silver cyanide
D-Glucopyranuronic acid, methyl ester, tetrabenzoate
Benzyl-2,3,6-tridesoxy-α-L-threo-hex-2-enopyranosid
5-{allyloxycarbonylmethyl-[(5-methyl-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-acetyl]-amino}-4-tert-butoxycarbonylamino-pentanoic acid benzyl ester
(4R,5R)-4-Allyl-5-hydroxymethyl-cyclohex-2-enone
methyl O-(2,3,4,6-tetra-O-acetyl-β-D-galactopyranosyl)-(1<*>6)-2,3,4-tri-O-benzoyl-β-D-galactopyranoside
2,3-O-benzylidene-7-tert-butoxycarbonyl-2,3-exo-dihydroxy-7-azabicyclo[2.2.1]heptene
