作者:Akio Kamimura、Koichiro Miyazaki、Shuzo Suzuki、Shingo Ishikawa、Hidemitsu Uno
DOI:10.1039/c2ob25386k
日期:——
Optically active ent-calystegine B4 was prepared in 13 steps from commercially available chiral L-dimethyl tartrate. The synthesis was achieved by the Michael addition and the aldol reaction of nitromethane to form cycloheptanone in a stereoselective manner. Reduction of the nitro group in the presence of Boc2O accomplished an efficient conversion to amino cycloheptanone, which readily afforded the
由市售的手性酒石酸L-二甲基酯以13个步骤制备旋光的ent- calystegine B4 。合成是通过迈克尔加成反应和Aldol的羟醛反应完成的。硝基甲烷 来形成 环庚酮以立体选择的方式。在存在下还原硝基Boc 2 O 完成了高效的转换 氨基环庚酮,这很容易得到所需的ENT -calystegine B4。