American Chemical Society
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Development of a Flexible and Robust Synthesis of Tetrahydrofuro[3,4‑b]furan Nucleoside Analogues

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journal contribution
posted on 2021-03-23, 19:20 authored by David A. Candito, Yingchun Ye, Ryan V. Quiroz, Michael H. Reutershan, David Witter, Surendra B. Gadamsetty, Hongming Li, Josep Saurí, Sebastian E. Schneider, Yu-hong Lam, Rachel L. Palte
In the context of a PRMT5 inhibitor program, we describe our efforts to develop a flexible and robust strategy to access tetrahydrofuro­[3,4-b]­furan nucleoside analogues. Ultimately, it was found that a Wolfe type carboetherification from an alkenol derived from d-glucofuranose diacetonide was capable of furnishing the B-ring and installing the desired heteroaryl group in a single step. Using this approach, key intermediate 1.3-A was delivered on a gram scale in a 62% yield and 9.1:1 dr in favor of the desired S-isomer. After deprotection of 1.3-A, a late-stage glycosylation was performed under Mitsunobu conditions to install the pyrrolopyrimidine base. This provided serviceable yields of nucleoside analogues in the range of 31–48% yield. Compound 1.1-C was profiled in biochemical and cellular assays and was demonstrated to be a potent and cellularly active PRMT5 inhibitor, with a PRMT5-MEP50 biochemical IC50 of 0.8 nM, a MCF-7 target engagement EC50 of 3 nM, and a Z138 cell proliferation EC50 of 15 nM. This work sets the stage for the development of new inhibitors of PRMT5 and novel nucleoside chemical matter for alternate drug discovery programs.