Nitration of methyl 12-acetylabieta-8,11,13-trien-18-oate (Ij) has given the products (Ik) and (IIIa), and the latter has been converted into methyl 13-hydroxypodocarpa-8,11,13-trien-18-oate (IIIf) in 26% overall yield from methyl abieta-8,11,13-trien-18-oate (Ib).
R. C. Cambie and R. A. Franich, J. Chem. Soc. D, 1970, 845 DOI: 10.1039/C29700000845
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