Substitution dependent stereoselective construction of bicyclic lactones and its application to the total synthesis of pyranopyran, tetraketide and polyrhacitide A
作者:B. V. Subba Reddy、Dhanraj O. Biradar、Y. Vikram Reddy、J. S. Yadav、Kiran Kumar Singarapu、B. Sridhar
DOI:10.1039/c6ob01686c
日期:——
A novel bicyclization strategy has been developed for the stereoselective synthesis of bicyclic lactones, i.e. 7-aryl or alkyl-2,6-dioxabicyclo[3.3.1]nonan-3-ones through a domino cyclization of (R)-3-hydroxyhex-5-enoic acid with an aldehyde in the presence of 10 mol% trimethylsilyltriflate under mild conditions. The salient features of this methodology are high yields, excellent selectivity, low catalyst
已经开发了一种新颖的双环化策略,用于通过(R)-3-羟基己基-的多米诺环合立体选择性合成双环内酯,即7-芳基或烷基-2,6-二氧杂双环[3.3.1] nonan-3-ones。在温和的条件下,在10摩尔%的三甲基甲硅烷基三氟甲基磺酸盐存在下,用醛制成的5-烯酸。该方法的显着特征是高收率,出色的选择性,较低的催化剂负载量和更快的反应时间。该方法已成功地应用于吡喃吡喃,四酮化合物和多杀菌素A的全合成。