Method for the Efficient Synthesis of Highly-Substituted Oxetan- and Azetidin-, Dihydrofuran- and Pyrrolidin-3-ones and Its Application to the Synthesis of (±)-Pseudodeflectusin
Highly substituted four- and five-membered heterocycles were prepared starting with O,P- and N,P-acetals by using a one-pot method involving base induced cyclization and a Horner-Wadsworth-Emmons (HWE) olefination reaction. Divergent synthesis of various heterocycles was achieved by using this method and transformations of the alkenyl group in the products of these processes were exemplified. Finally, a short and efficient synthesis of (+/-)-pseudodeflectusin based on the new methodology was achieved.
A concise synthesis of (±)-pseudodeflectusin, an antitumor isochroman derivative isolated from Aspergillus sp.
A novel and concise synthesis of (+/-)-pseudodeflectusin (1), an antitumor isochroman derivative isolated from the culture broth of Aspergillus pseudodeflectus, was accomplished by starting from 4-(tert-butyldimethylsilyloxy)-1-pentyne(3) and diethyl 3-oxopentanedicarboxylate (5). (C) 2007 Elsevier Ltd. All rights reserved.