Synthesis of 4-Hydroxy-4H-chromenes by Reaction of Salicylic Aldehydes with Alkynals Catalyzed by Silyl Prolinol Ethers

[摘要]：We report an oxa-Michael/Baylis-Hillman tandem reaction between salicylaldehydes and alk-2-ynals activated by silyl prolinol ethers, affording 2,3-disubstituted 4-hydroxy-4H-chromenes in good yields and enantiomeric ratios (up to 98:2).

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