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. Author manuscript; available in PMC: 2022 May 23.
Published in final edited form as: Org Lett. 2017 Mar 8;19(6):1486–1489. doi: 10.1021/acs.orglett.7b00547

Table 2.

Comparison of Selected 13C-NMR Shiftsa

peak 1 1-ME 2/3b 4 4-ME 5 5-ME

C2 43.1 44.0 43.9 44.0 44.0 44.0 44.0
C3 83.4 83.9 83.9 83.9 83.9 83.8 83.7
C4 55.2 55.4 55.7 55.6 55.4 56.2 55.8
C5 86.2 86.5 86.6 86.6 86.5 86.8 86.7
C6 39.3 39.6 39.5 39.6 39.6 40.0 40.0
C22 24.0 24.1 23.8 23.9 24.1 24.9 24.9
C23 23.2 23.3 23.2 23.2 23.2 23.5 23.4
a

Data (in CDCl3) obtained from refs 8, 10, and 15.

b

Mixture of isomers. ME = methyl ester.