Journal of the Chemical Society. Perkin transactions I p. 151 - 155 (1996)
Update date:2022-09-26
Topics:
Bush, Edward J.
Jones, David W.
(-)-Podophyllotoxin of 98% optical purity has been synthesized in eight steps and in 15% overall yield. The key step, Diels-Alder addition of the o-quinonoid pyrone 2 [6,7-methylenedioxy-1-(3,4,5-trimethoxyphenyl)-2-benzopyran-3-one] to the chiral dienophile 5 [5-(-)-menthyloxyfuran-2(5H)-one], proceeds with very high regio-, endo- and facial selectivity.
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