1: 96 percent 2: 62 percent / CrO3, 3,5-dimethylpyrazole 3: Li, liq. NH3 / ethanol 4: 93 percent / LAH 5: n-BuLi 6: n-Bu3SnH, AIBN 7: PTSA 8: 2,6-Lutidine 9: 97 percent 10: SOCl2, Py 11: TBAF / tetrahydrofuran 12: (COCl)2, DMSO, Et3N View Scheme