One-Pot Synthesis of TBMPS (bis [tert-Butyl)-1 Pyrenylmethyl-Silyl) Chloride as a Novel Fluorescent Silicon-Based Protecting Group for Protection of 5′-OH Nucleosides and Its Use as Purification Handle in Oligonucleotide Synthesis

An efficient and novel synthesis of bis(tert-butyl)-1-pyrenylmethyl-silyl group (TBMPS) has been reported having fluorescent properties conferred by the pyrenyl group. This silyl group being base labile is efficiently used for one-pot protection of the 5′-OH of the nucleosides. While incorporated terminally at the 5′-OH of long sequences viz. AA TGG AGC CAG T and GC TAT GTC AGT TCC CCT TGG TTC TC, this group is also helpful in subsequent purification by HPLC as well as PAGE. Besides these, a labeled dimer (T*T) and a labeled tetramer (T*TTT) were also synthesized to compare the fluorescence properties of short and long labeled sequences. Fluorescence properties of these sequences were studied in detail to find the suitability of the approach.

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