New phosphorus self-assembling ligands for the tandem hydroformylation–Wittig olefination reaction of homoallylic alcohols — A key step for stereoselective pyran synthesis

• Four new self-assembled phosphorus ligands were synthesized.
• Homo-allylic olefin was directly used in tandem hydroformylation–Wittig reaction.
• Two more carbon 7-hydroxy enoates were formed in one step.
• The diastereoselectivity of β-pyran produced by oxa-Michael reaction was up to 99%.

New self-assembled phosphorus ligands are synthesized and used in the rhodium complex catalyzed hydroformylation–Wittig reaction of homoallylic olefins under optimized condition. A subsequent oxa-Michael intramolecular reaction yields β-pyran derivatives (conversion and diastereoselectivity up to 99%).

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