Diastereoselective Synthesis of 1-Allyl and 1,2-bis(Allyl)-1,2-diols: Versatile Synthons For Substituted Tetrahydrofuran Derivatives
作者:Subodh Kumar、Pervinder Kaur、Swapandeep Singh Chimni、Palwinder Singh
DOI:10.1055/s-2001-16774
日期:——
2-Hydroxyketones and 2-ketoaldehydes undergo indium mediated highly diastereoselective mono and bis- allylation reactions to give respective 1-allyl 2a-c and 1,2-bis (allyl)-7a-c 1,2-diols. 2a undergoes I2/NaHCO3 and m-CPBA mediated diastereoselective intramolecular cyclizations to provide respective (2S*,3R*,5S*)-2,3-diphenyl-4-hydroxy-5-iodo methyltetrahydrofuran 4a and (2S*,3R*,5R*)-2,3-diphenyl-4-hydroxy-5-hydroxymethyl tetrahydrofuran 5b as major product.
2-羟基酮和2-酮醛在铟介导下经历高度立体选择性的单和双烯丙基化反应,分别生成1-烯丙基2a-c和1,2-双(烯丙基)-7a-c的1,2-二醇。2a在I2/NaHCO3和m-CPBA介导下发生立体选择性的分子内环化反应,分别得到主要产物(2S*,3R*,5S*)-2,3-二苯基-4-羟基-5-碘甲基四氢呋喃4a和(2S*,3R*,5R*)-2,3-二苯基-4-羟基-5-羟甲基四氢呋喃5b。