Synthetic studies towards novel tetracyclic lycopodium alkaloids: A synthesis of deoxymagellaninone
作者:Goverdhan Mehta、M.Sreenivasa Reddy、Abraham Thomas
DOI:10.1016/s0040-4020(98)00421-9
日期:1998.7
A short, novel, linear triquinane-based strategy, directed towards the synthesis of complex tetracyclic alkaloids of paniculatine and magellanine-type, and culminating in the synthesis of deoxymagellaninone 32 is delineated. The cornerstone of our approach was the utilization of the ‘carbocycle-heterocycle equivalency’ stratagem to generate the N-methylpiperidine ring-D from a cyclopentene precursor
Electrophilic Addition of Phenylsulfenyl Chloride to Carbon-Carbon Double Bonds in Pentacyclic and Tetracyclic Cage Enones
作者:Alan P. Marchand、Yanjun Wang、Ralf Eckrich、Simon G. Bott
DOI:10.1080/00397919708004178
日期:1997.9
Abstract Reaction of tetracyclo]6.3.0.03,7.04,11]undec-9-en-5-one (3) and of pentacyclo[9.2.0.04,8.05,13.07,12]tridec-9-en-3-one (4) with PhSCl proceeds via addition across the carbon-carbondouble bond with concomitant transannular trapping by C=O of the resulting carbocationic intermediate, thereby affording 5 (50%) and 6 (59%), respectively. The structure of 5 was established unequivocally via application
四环]6.3.0.03,7.04,11]undec-9-en-5-one (3) 和五环 [9.2.0.04,8.05,13.07,12]tridec-9-en-3-one (4) 的抽象反应) 与 PhSCl 通过在碳 - 碳双键上的加成进行,伴随着由所得碳阳离子中间体的 C = O 引起的跨环捕获,从而分别提供 5 (50%) 和 6 (59%)。5 的结构是通过应用 X 射线晶体学方法明确确定的。
Ipaktschi, Junes; Sang, Bernd, Liebigs Annalen der Chemie, 1992, # 10, p. 1029 - 1032