have developed a novel synthetic route to nitrogen-containing heterocycles via radical addition–ionic cyclization reaction. Treatment of oxime ethers carrying the tosyloxy group with Et3B and alkyl iodide in the presence of Lewis acid gave the substituted pyrrolidines and piperidines. The reaction of oxime ethers carrying the methoxycarbonyl group proceeded under the same conditions to give the amino
Synthesis of 8-deoxypumiliotoxin 193H and 9-deoxyhomopumiliotoxin 207O
作者:Takuya Okada、Taiga Yamamoto、Daiki Kato、Masashi Kawasaki、Ralph A. Saporito、Naoki Toyooka
DOI:10.1016/j.tetlet.2018.09.015
日期:2018.10
The asymmetricsynthesis of 8-deoxypumiliotoxin 193H and 9-deoxyhomopumiliotoxin 207O has been achieved, starting from both enantiomers of (+)- and (−)-10. Enantiomerically pure alcohols (+)- and (−)-10 were obtained by lipase-mediated kinetic resolution of racemic 10, which was prepared in 3 steps from new lactam-type building block (−)-8 in a highly stereoselective manner.