Scheme (2)
Synthetic pathways to analogs
13-14
. Reagents and conditions: (a) BH
3
/THF, 0
o
C-rt (b) TBAI, Pyridine, CH
2
Cl
2
, Tf
2
O, -78
o
C-rt (c) NaN
3
, MeCN, reflux (d) PPh
3
, rt (e) 2-Furoic acid, HBTU, Et
3
N, MeCN, rt.
