Abstract
matrix presented A concise approach to the cephalotaxine CDE ring skeleton based on the intramolecular formal [5 + 2] photocycloaddition of cyclopentenyl-substituted maleimides is described. An investigation of the diatereoselectivity afforded by various protected alkoxy groups demonstrated that the best selectivity (3.5:1) was afforded by the free hydroxyl group, strongly suggesting a hydrogen-bonded excited state.
Original language | English |
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Pages (from-to) | 3005-3008 |
Number of pages | 4 |
Journal | Organic Letters |
Volume | 3 |
Issue number | 19 |
DOIs | |
Publication status | Published - 20 Sept 2001 |