1273232-46-4

Upstream product

• 177944-16-0 (R)-N-(but-3-en-1-yl)-N-(α-methylbenzyl)amine 
• 1085845-83-5 tert-butyl (2E,4S,5R)-4,5-O-isopropylidene-hepta-2,6-dienoate 
• 38838-06-1 methyl 5-deoxy-5-iodo-2,3-isopropylidene-β-D-ribofuranoside 
• 4099-85-8 ((3aR,4R,6R,6aR)-6-methoxy-2,2-dimethyltetrahydrofuro[3,4-d][1,3]dioxol-4-yl)methanol 
• 532-20-7 D-Ribose 

Relevant academic research and scientific papers

Asymmetric synthesis of polyhydroxylated pyrrolizidines via transannular iodoamination with concomitant N-debenzylation

The doubly diastereoselective "matched" conjugate addition of lithium (R)-N-but-3-enyl-N-(α-methyl-p-methoxybenzyl)amide to tert-butyl (4S,5R,E)-4,5-O-isopropylidene-2,7-dienoate (derived from d-ribose in 3 steps) and in situ enolate oxidation with (-)-camphorsulfonyloxaziridine was followed by ring-closing metathesis with Grubbs I to give a hexahydroazocine scaffold. Subsequent treatment with I2 resulted in transannular iodoamination accompanied by loss of the α-methyl-p-methoxybenzyl group to give the corresponding pyrrolizidine scaffold as a single diastereoisomer upon direct crystallization from the crude reaction mixture. Further functional group manipulations enabled the preparation of (-)-7a-epi-hyacinthacine A1.