Add time:07/19/2019         Source:sciencedirect.com

(−)-δ-N-normethylskytanthine (1) has been synthesised from (1R,4R,1′S)-2-(phenylethyl)-2-azabicyclo[2.2.1]hept-5-ene (2) which undergoes a ketene-amino-Claisen rearrangement by reaction with dichloroketene to generate (1S,6R,1′S)-3-(phenylethyl)-5,5-dichloro-4-keto-3-azabicyclo[4.3.0]non-7-ene (3), which could be converted to 1 in eleven steps.

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