Synthesis of trans-syn-trans fused bis-pyrans via endo-selective cyclizations of cyclic sulfates
作者:Frank E. McDonald、Prahlad Vadapally
DOI:10.1016/s0040-4039(99)00214-2
日期:1999.3
Acid-catalyzed cyclization of hydroxy-cyclic sulfates occurs with endo-regioselectivity affording bispyran products from substrates in which the nucleophilic hydroxyl and electrophilic cyclic sulfate groups are 1,2-trans-substituted on a cyclic pyran template. This methodology is demonstrated in an enantioselective synthesis of the trans-syn-trans fused AB cyclic ether rings of the brevetoxin natural
羟基环硫酸盐的酸催化环化反应具有内-区域选择性,从底物得到双吡喃产物,其中在环吡喃模板上亲核羟基和亲电环硫酸盐基团被1,2-反式取代。该方法在短毒素天然产物的反式-顺式-反式稠合的AB环醚环的对映选择性合成中得到证明。