C-6 allylated pyranosides for the synthesis of complex oxygenated tetrahydrofurans
作者:Mohindra Seepersaud、Michael Blumenstein、David R. Mootoo
DOI:10.1016/s0040-4020(97)00282-2
日期:1997.4
The iodoetherification of C6 allylated D-pyranosides containing an allylic benzyloxy substituent, and their acyclic 5-hexen-, 1,2,4-triol analogs were performed. Pyranosides of R configuration at the allylic ether gave exclusively a syn,syn-2,5-dialkyi-3-oxy-tetrahydrofuran which is primed for elaboration into several classes of naturally occurring THF's. By comparison, the stereoselectivity for the non-pyranoside derivative was much lower. In the S series, the bias was opposite for the pyranoside vs, the non-pyranoside substrates, but the selectivity in both cases was low. (C) 1997 Elsevier Science Ltd.