In this work, stemoamide has been prepared in its racemic form, as a 5 : 1 mixture of epimers, while attempting to obtain the putative structure of parvistemoamide, as previously described to be isolated from S. parviflora.
Diastereoselective addition of nitro compounds to α,β-unsaturated γ-butyrolactones
作者:Giovanni B. Rosso、Ronaldo A. Pilli
DOI:10.1016/j.tetlet.2005.10.163
日期:2006.1
Herein, we report our results on the diastereoselective addition of nitrocompounds to α,β-unsaturated γ-butyrolactones, which afforded the corresponding Michael adducts 9–17 in moderate to good yields and good to excellent diastereoisomeric ratio. A one-pot conversion of α,β-unsaturated γ-butyrolactones 7 and 8 to the corresponding trisubstituted keto-γ-butyrolactones 24 and 25 via a tandem Michael–Nef