Expectedly, in the absence of DIPEA, HE and PC the reaction does not work (entry 8); however, as noted above, a moderate yield of 47% was obtained in the absence of pDTCz-DPmS (entry 5). Removal of either HE or DIPEA resulted in a reduction of the yield of the background reaction to 27% and 33%, respectively (entries 6 and 7).