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• W2951480748 abstract "The synthesis of 2-(N,N-diisopropylamino)-2,3-dihydro-3-methylsulfonyl-1,3,2-benzoxazaphospholes 22, 23 and 24 is reported. Their reactivities have been investigated using a variety of acid catalyst under conditions normally employed in phosphoramidite chemistry for oligonucleotide synthesis. The rate (k) of activation of 22, 23 and 24 by acid catalysis with N-methylanilinium hydrochloride (MAC) to their protonated species 25A, 26A and 27A, respectively, (Scheme 2) has been estimated to be 6.813 × 10−7mol−1min−1, 1.237 × 10−6mol−1min−1 and 1.972 × 10−7mol−1min−1 at 18°C with a ratio of the rates as 0.56 : 1 : 0.16. The 5-chlorobenzoxazaphosphole 23 selectively activated by MAC gave the intermediate 2-(N-methylanilinium)-5-chlorobenzoxazaphosphole 26A (∼90% by NMR), which was then reacted with alcohols (nucleosides) to generate the reactive 2-alkoxybenzoxazaphosphole 30 (Scheme 4) or 33–35 (Scheme 5) (∼70% by NMR). We have then shown that 33–35 (Scheme 5) react with binucleophilic reagents, ADP, ATP or pyrophosphate, to generate the corresponding P1-alkoxycyclometatriphosphite intermediate 36, 37, 50, 52 or 54. These intermediates were then sulfurised to form the P1-alkoxy-1-thiocyclotriphosphate intermediates 38, 39, 51, 53 and 55, which were ring-opened by hydrolysis. Thus these steps constituted a one-pot multicomponent reaction (MCR) leading to the synthesis of RP and SP mixtures of each of the mono-thioanalogues of naturally-occurring oligophosphates: ApsppA (43) (10%), ApspppA (45) (19%), ppp5′A2′ps5′A (46) (24%), the cap structure m7GpsppA (47) (3%), Apspppp (42) (23%), Apspp (41) (33%) and Apsp (40) (7%). The reaction of putative 34 and ADP gave the desired 43 (10%) along with pp5′A2′ps 5′A (44) (5%). The reaction sequences from 34 and ATP gave 45 (19%) and ppp5′A2′ps5′A (46) (24%). The proposed reaction mechanism for the synthesis of 43, 45 and 47 proceeds via the corresponding (dinucleoside 5′)-cyclometatriphosphite intermediates 50, 54, 52 and the (dinucleoside 5′)-1-thiocyclotriphosphate intermediates 51, 55, 53. The existence of these cyclic P(III) and P(V) intermediates were supported by31P- and1H-NMR spectroscopy. We here also demonstrate that 5-chlorobenzoxazaphosphole 23 can be used to synthesise a protected ribonucleoside 2′,3′-cyclic phosphorothioate block 28, a protected ribonucleoside 3′-(O-(4-chloro-2-mesylsulfonamido)phenyl phosphorothioate diester block 29 and bis(2-deoxyadenosine-5′)-thymidine-3′-monophosphate 32. The correct coupling of the nucleoside residues to the oligophosphate chain in 43, 45 & 47 has unequivocally been assessed by 2D31P-31P and1H-31P correlation spectroscopy." @default.
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• W2951480748 date "1995-03-01" @default.
• W2951480748 modified "2023-09-26" @default.
• W2951480748 title "The synthesis and reactivity of new 2-(N,N-diisopropylamino)-3-methylsulfonyl-1,3,2-benzoxazaphospholes. The utility of the 5-chloro analogue in the one-pot synthesis of oligothiophosphates: [ApsppA, ApspppA, ppp5′A2′ps5′A, m7GpsppA, Apspppp, Apspp]" @default.
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• W2951480748 doi "https://doi.org/10.1016/0040-4020(95)00031-3" @default.
• W2951480748 hasPublicationYear "1995" @default.
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