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- W1997246103 abstract "The 2-benzopyran-3-one 10 is a stable, isolable and useful Diels–Alder diene; its methyl 4-benzoyloxycrotonate adduct 23 formed regioselectively and stereoselectively in acetonitrile is reduced with, H2/Pd to give 31 with inversion of C-1-stereochemistry. The latter is readily converted into methyl podophyllate 34(Scheme 2) which is directly lactonised to podophyllotoxin using ZnCl2/4 Å molecular sieves in tetrahydrofuran. The factors leading to exo-selective additions to α-aryl-o-quinodimethanes are briefly discussed." @default.
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- W1997246103 date "1993-01-01" @default.
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- W1997246103 title "Synthesis of podophyllum lignans via an isolable o-quinonoid pyrone" @default.
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- W1997246103 doi "https://doi.org/10.1039/p19930002533" @default.
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