The firstenantioselectivesynthesis of the recently reported ant alkaloid 1 has been achieved starting from commercially available lactam 3 in seven steps and 25% overall yield. The proposed structure of the natural product was confirmed by comparison with synthetic 1 and its absolute configuration established as 3S,5R,8S,9S.
Synthesis, Determination of the Absolute Stereochemistry, and Evaluations at the Nicotinic Acetylcholine Receptors of a Hydroxyindolizidine Alkaloid from the Ant Myrmicaria melanogaster
作者:Naoki Toyooka、Dejun Zhou、Hideo Nemoto、Kaoru Yamaguchi、Hiroshi Tsuneki、Tsutomu Wada、Toshiyasu Sasaoka、Hideki Sakai、Yasuhiro Tezuka、Shigetoshi Kadota、Tappey H. Jones、H. Martin Garraffo、Thomas F. Spande
DOI:10.3987/com-08-s(d)16
日期:——
The first chiral synthesis of new hydroxyindolizidine alkaloid (1) detected in the ant Myrmicaria melanogaster has been achieved, and its absolute stereochemistry was determined to be 3S, 5R, 8S, 9S by the present chiral synthesis.
A concise and fully selective synthesis of the ant venom alkaloid (3S,5R,8S,9S)-3-butyl-5-propyl-8-hydroxyindolizidine
作者:Geng-Jie Lin、Pei-Qiang Huang
DOI:10.1039/b912190k
日期:——
A seven-step synthesis of (3S,5R,8S,9S)-3-butyl-5-propyl-8-hydroxyindolizidine (2), an ant venom alkaloid isolated from Myrmicaria melanogaster, is disclosed with an overall yield of 28.9%. The key feature of the synthesis is the use of the iodocyclization for the introduction of the hydroxyl group of the 3-piperidinol. Remarkably, all the reaction steps proceeded with excellent chemo-, regio- and/or diastereoselectivities.