The method 1, wherein step is carried out by treating {HEAD ~ the compound} of the formula in DMF in the presence of {TAIL ~ 20 to 40 molar equivalents} of POCl3 
The method 1 , wherein step is carried out by treating { HEAD ~ the compound } of the formula in DMF in the presence of { TAIL ~ 20 to 40 molar equivalents } of POCl3
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH