wt/vol

 

wt/vol

MW

moles

density

equivs.

yield

I

0.053 g

386.71

0.0001

 

1.0

 

II

0.039 g

172.57

~0.0002

 

1.5

 

III

0.035 g

84.01

0.0004

 

4.0

 

IV

3.0 mL

-

-

 

 

 

V

0.040 g

402.71

0.0001

 

 

(72%)

 

Procedure:  10 mL 1-neck flask, stirbar, septum, N2 inlet

                  Dissolved 0.053 g of alcohol I in 3.0 mL of dry CH2Cl2.  Stirred at rt.  Added 0.035 g of NaHCO3 followed by 0.039 g of mCPBA (57-86%).  After 2 h, TLC (20:80 EtOAc-hexanes, CAM) showed product spot at Rf 0.45.  The reaction mixture was concentrated to ~0.2 mL by rotary evaporation and purified by flash chromatography on silica gel using 20:80 EtOAc-hexanes as eluant.  The product was a clear, colorless oil. 

 

1H NMR (CDCl3, 300 MHz) d 5.59 (dq, J = 15.4, 6.6 Hz, H7), 5.37 (ddd, J = 15.4, 7.3, 1.5 Hz, H6), 4.02 (dd(apparent t), J = 6.6 Hz, H5), 3.94 (bd, H1), 3.58 (bd, H1), 3.21 (dd, J = 6.2 Hz, H4), 3.08 (m, H2, H3), 1.68 (d, J = 6.6 Hz, H8), 0.88 (s, SiC(CH3)3), 0.87 (s, SiC(CH3)3), 0.08 (s, SiCH3), 0.05 (s, SiCH3), 0.02 (s, SiCH3), 0.01 (s, SiCH3). 

 

notes