5- and 6-Exocyclic Products, <i>cis</i>-2,3,5-Trisubstituted Tetrahydrofurans, and <i>cis</i>-2,3,6-Trisubstituted Tetrahydropyrans via Prins-Type Cyclization
作者:Satish. N. Chavre、Hyunah Choo、Jae Kyun Lee、Ae Nim Pae、Youseung Kim、Yong Seo Cho
DOI:10.1021/jo800967p
日期:2008.10.3
Exocyclic products having cis-2,5 and cis-2,6 substitution were synthesized from terminally substituted alkynyl alcohols with various aldehydes viaPrins-typecyclization in good yields. It is of interest that synthesized 5- and 6-exocyclic vinyl cations generated as a result of Prins-typecyclization could be trapped as a vinyl triflate in CH2Cl2 to give 3-furanylidenes and 3-pyranylidenes. Those