Various alkylidenephthalides (E- and Z-5, 6 and 7) were prepared by Wittig reaction of phosphoranes 4a, 4b and 4c respectively with phthalic anhydride.The products were then lactonised, using chloro(trimethyl)silane and sodium iodide, to the corresponding
Chordia, Mahendra D.,Narasimhan, Nurani S.
p. 371 - 376
(2007/10/02)
TOTAL SYNTHESIS OF CATALPALACTONE
The first synthesis of catalpalactone (1) is reported.The key steps are the coupling of the selenenylated lactone 8 with bromophthalide (9) and the selenoxide elimination of 14 to give catalpalactone with very high regioselectivity.
Marx, John N.,Dobrowolski, Paul J.
p. 4457 - 4460
(2007/10/02)
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