SCHEDULED MAINTENANCE
The side-chain of 25-hydroxycholesterol was constructed stereospecifically on the androstane skeleton via addition of an ethyl acetate unit to C-17 and sub-sequent alkylation of the resulting ester C-20 with a C5 unit; the remaining carbon atom (C-27) was added by a Grignard reaction.
J. Wicha and K. Bal, J. Chem. Soc., Chem. Commun., 1975, 968 DOI: 10.1039/C39750000968
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