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 cyclicsulfate groups are 1,2-trans-substituted on a cyclic pyran template. This methodology is demonstrated in an enantioselectivesynthesis of the trans-syn-trans fused AB cyclic ether rings of the brevetoxin natural