Proton deficient molecules are generally considered difficult to do structure validation and/or elcucidation on. However, there have been some recent advancements. Let me know if you want to try some of these pulse programs.
This has been implemented in Bruker. The pulse program is called adeq1netgprdsp.
In the above article in Organic Letters, 1D 13C NMR, whether it be broad-band-decoupled(during both d1 and acquisition) or inverse-gated-decoupled and acquired with short d1 is proven to be a convenient quantitative tool to obtain ratios of diastereomers,regioisomers,constitutional isomers,mixtures of unrelated compounds, peptoids,and sugars when care is taken to consider differences in NOEs, and relxation times.
The above paper describes four computer-assisted structure elucidation(CASE) programs used for natural products. We currently don't have the license for the structure elucidation plug-in for Mnova. Topspin software which is free and available on Bruker website comes with CMC-se but also with limited functionality.