A ten-step synthesis of a racemic form of 3(Z),11(S)-dodecen-11-olide (ferrulactone II) has been developed. The synthesis is based on the Cadiot-Chodkiewicz cross-coupling of 4-pentyn-2-ol with 2-propyn-1-ol followed by carbon chain elongation by 3-butyn-1-ol and gives the target lactone in 9.7 % overall yield (based on the starting pentynol). Air of the three building blocks used for the chain assembly are easily accessible from acetylene. The protection of OH groups as tert-butyl ethers has certain synthetic advantages.
A ten-step synthesis of a racemic form of 3(Z),11(S)-dodecen-11-olide (ferrulactone II) has been developed. The synthesis is based on the Cadiot-Chodkiewicz cross-coupling of 4-pentyn-2-ol with 2-propyn-1-ol followed by carbon chain elongation by 3-butyn-1-ol and gives the target lactone in 9.7 % overall yield (based on the starting pentynol). Air of the three building blocks used for the chain assembly are easily accessible from acetylene. The protection of OH groups as tert-butyl ethers has certain synthetic advantages.
N-Propargyl derivatives of the alkaloid anabazine with carbonyl, ester, and cyano groups in the side chain were obtained by three-component condensation of anabazine hydrochloride with paraformaldehyde and appropriate terminal alkynes. Decyanoethylation and hydration of the isopropylidene double bond resulted in mono-and dihydroxy derivatives of N-propargyl-anabazines, respectively.
A ten-step synthesis of a racemic form of 3(Z),11(S)-dodecen-11-olide (ferrulactone II) has been developed. The synthesis is based on the Cadiot-Chodkiewicz cross-coupling of 4-pentyn-2-ol with 2-propyn-1-ol followed by carbon chain elongation by 3-butyn-1-ol and gives the target lactone in 9.7 % overall yield (based on the starting pentynol). Air of the three building blocks used for the chain assembly are easily accessible from acetylene. The protection of OH groups as tert-butyl ethers has certain synthetic advantages.