Propose an efficient synthesis for the following (4) transformations considering:

1.

2.

3.

4.

Thank you!!

The transformation above can be performed with some reagent or combination of the reagents listed below. Give the necessary reagent(s) in the correct order, as a string of letters (without spaces or punctuation, such as EBF). If there is more than one correct solution, provide just one answer. A B D t-BuOK 1) MeMgBr; 2) H30+ Na2Cr2O7, H2SO4, H20 NaOH E F G H H2, Lindlar's cat. H2, Pt TsCl, py dilute H2SO4 1 J K L 1) LiAlH4; 2) H30+ DMP or PCC 1) EtMgBr; 2) H30+ 1) BH3.THF; 2) H2O2, NaOH CI H