作者:Xiaoming Feng、Zhengyan Fu、Bo Gao、Zhipeng Yu、Lan Yu、Yaozhong Huang、Guolin Zhang
DOI:10.1055/s-2004-830869
日期:——
A highly efficient method for the formation of optically active 2,5-disubstituted dihydropyrones using catalytic enantioselective hetero-Diels-Alder reaction of (E)-3-methyl-4-methoxy-2-[(trimethylsilyl)oxy]-1,3-butadiene with aldehydes is presented. In the presence of 5 mol% chiral titanium(IV) complex, this catalytic reaction proceeded smoothly to afford corresponding dihydropyrones in moderate to excellent yields with high enantioselectivities (up to 99% ee).
本研究提出了一种利用 (E)-3- 甲基-4-甲氧基-2-[(三甲基硅)氧基]-1,3-丁二烯与醛的催化对映选择性杂-Diels-Alder 反应生成光学活性 2,5-二取代二氢吡喃的高效方法。在 5 摩尔手性钛(IV)络合物存在下,该催化反应顺利进行,以中等到极好的产率和高对映选择性(高达 99% ee)得到相应的二氢吡咯。