Regiochemical control of the ring opening of 1,2-epoxides by means of chelating processes. Part 17: Synthesis and opening reactions of cis- and trans-oxides derived from (2S,6R)-2-benzyloxy-6-methyl-3,6-dihydro-2H-pyran, (2R,6R)- and (2S,6R)-2-methoxy-6-methyl-5,6-dihydro-2H-pyran
作者:Paolo Crotti、Valeria Di Bussolo、Lucilla Favero、Franco Macchia、Mauro Pineschi
DOI:10.1016/s0040-4020(02)00578-1
日期:2002.7
The regiochemical behavior of the title deoxy anhydrosugars, prepared in an enantioselective way starting from methyl α-d-glucopyranoside, was examined in opening reactions, both under standard and chelating conditions. The results clearly indicate the influence of the reaction conditions and the importance of the relative orientation of the methyl group with respect to the oxirane ring on the regiochemical
在标准和螯合条件下,在开放反应中检查了以对映选择性方式从甲基α-d-吡喃葡萄糖苷开始制备的标题脱氧脱水糖的区域化学行为。结果清楚地表明了反应条件的影响以及甲基相对于环氧乙烷环的相对取向的重要性对这些环氧化物的区域化学结果的影响。在某些情况下,可以获得区域选择性的有效反转。