Mild and practical stereoselective synthesis of (Z)- and (E)-allyl bromides from Baylis–Hillman adducts using Appel agents (PPh3/CBr4): a facile synthesis of semiplenamides C and E
Appel agents (PPh3/CBr4) have been utilized for high-yielding stereoselective synthesis of (Z)- and (E)-allyl bromides from Baylis–Hillman adducts at room temperature. The method has been applied for the synthesis of naturallyoccurring bioactive fatty acid amides, semiplenamides C and E.
Treatment of Baylis–Hillman adducts with Et3SiH/I2 in CHCl3 at room temperature afforded the (Z)- and (E)-allyl iodides in stereoselective manner. The products are formed in excellent yields within 5 min. The method has successfully been utilized for synthesis of natural bioactive fatty acid amide, semiplenamide D.