| |
[摘要]：Diels-Alder reaction of furan with electron-deficient 3-carbethoxycoumarins gave the Michael-type adducts obtained from the rearrangement of the intermediate Diels-Alder adducts, instead of the Diels-Alder cycloadducts. Trapping of the dipolar intermediate with electron-deficient aromatic aldehydes gave a one-pot access to fused furo[3,2-b]pyranochroman-2-ones with multiple stereogenic centers. Ring opening of the lactone moiety gave a facile route to generate diverse scaffolds. |
|
