摘要
前文我们报道了新型手性试剂5-(l-孟氧基)-3-溴-2(5H)-呋喃酮(1)的合成及其结构.在此工作基础上,本文又进一步研究了1与氧的亲核试剂,如二苯甲醇、苯甲醇、α-甲基苯甲醇、薄荷醇、冰片醇发生新颖的串联不对称双Michael加成/分子内亲核取代反应,合成了一般方法难以合成的含有多个手性中心的螺[1-溴-4-l-孟氧基-5-氧杂-6-氧代双环[3.1.0]己烷-2,3′-(4′-亲核基-5′-孟氧基丁内酯)](4a~4e).通过元素分析,IR,UV,<sup>1</sup>H NMR,<sup>13</sup>C NMR,MS,[α]<sub>D</sub><sup>20</sup>谐波谱分析数据以及X四圆衍射确定了4a~4e的化学结构和绝对构型.其合成路线见图1.
Tandem asymmetric reactions of 1 with nucleophilic alcohols afforded optically pure spiro-cyclopropane derivatives with four stereogenic centers 4a ~ 4e in 64% ~ 88% yields with d. e. >98%. The optically pure compounds 4a ~ 4e were identified on the basis of their analytical data, such as [a]D20, UV, IR, 1H NMR, 13C NMR, MS and elemental analysis. The absolute configuration of the chiral spiro-cyclopropane compound (4a) was established by X-ray crystallography.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
1999年第6期641-643,共3页
Acta Chimica Sinica
基金
国家自然科学基金(29672004)资助项目
关键词
手性
晶体结构
合成
螺环丙烷双内酯
5-(l-menthyloxy)-3-bromo-2(5H)-furanone, tandem asymmetric Michael reaction/internal nucleophilic substitution, spiro-cyclopropane derivatives containing multichiral centers, crystal structure