Journal of the Chemical Society. Chemical communications p. 262 - 263 (1980)
Update date:2022-08-04
Topics:
Murphy, William S.
Wattanasin, Sompong
Cyclopropanation of the chalcone (3) with dimethylsulfonium ethoxycarbonylmethylide affords a 1:1 mixture of the cyclopropanyl keto-ester epimers (4) and (5); both stannic chloride and boron trifluoride etherate in nitromethane catalyse the stereoselective cyclisation of this mixture to the tetralone (2), the known podophyllotoxin precursor, in 51percent overall yield.
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