作者:Hiroshi Nagase、Naoshi Yamamoto、Toru Nemoto、Kenji Yoza、Kenshu Kamiya、Shuichi Hirono、Shinobu Momen、Naoki Izumimoto、Ko Hasebe、Hidenori Mochizuki、Hideaki Fujii
DOI:10.1021/jo801276z
日期:2008.10.17
The treatment of morphinan I with NaH and MsCl provided very stable iminium salt 7 possessing propellane skeleton. One of the synthesized iminium salts 7, isobutyl derivative 7b, was crystallized and its structure was determined by X-ray crystallography. The natural bond orbital analysis suggested that the stability of the iminium should result from the stereoelectronic effect (hyperconjugation) attributed to their own structures.