作者:Winfred G. Beyersbergen van Henegouwen、Rutger M. Fieseler、Floris P. J. T. Rutjes、Henk Hiemstra
DOI:10.1002/(sici)1521-3773(19990802)38:15<2214::aid-anie2214>3.0.co;2-v
日期:1999.8.2
A novel iodide-promoted, allene-terminated cyclization of an N-acyliminium ion, a stereoselective Heck spirocyclization, and a chemoselective demethylation at the nitrogen atom of an oxindole are the key transformations in the first total synthesis of the indole alkaloid (+)-gelsedine (1). This dextrorotatory form of natural gelsedine was formed as a single enantiomer in 21 steps from (S)-malic acid
N-酰基亚胺离子的碘化物促进的,由烯丙基终止的环化,立体选择性的Heck螺环化和在羟吲哚的氮原子上的化学选择性脱甲基化是吲哚生物碱(+)-明胶(1)。天然明胶的这种右旋形式是由(S)-苹果酸分21步形成的单一对映体。