[7] Condensation with the ylide from Triethyl phosphonoacetate (HWE reaction) affords diester 2.

Catalytic hydrogenation proceeds from the less hindered face to afford the corresponding saturated diester (3).

The esters are then reduced by means of LiAlH4 to give the glycol (4); this undergoes internal ether formation on treatment with acid to form the pyran ring of 5.

Von Braun reaction with BrCN (or ethyl chloroformate) followed by saponification of the intermediate leads to the 2° amine (6).

This is converted to the cyclopropylmethyl derivative 8 by acylation with cyclopropylcarbonyl chloride[8][9] followed by reduction of the thus formed amide (7) with LiAlH4.