作者:Heyao Shi、Iacovos N. Michaelides、Benjamin Darses、Pavol Jakubec、Quynh Nhu N. Nguyen、Robert S. Paton、Darren J. Dixon
DOI:10.1021/jacs.7b10956
日期:2017.12.13
The first enantioselective synthesis of (−)-himalensine A has been achieved in 22 steps. The synthesis was enabled by a novel catalytic, enantioselective prototropic shift/furan Diels–Alder (IMDAF) cascade to construct the ACD tricyclic core. A reductive radical cyclization cascade was utilized to build the B ring, and end-game manipulations featuring a molecular oxygen mediated γ-CH oxidation, a Stetter
(-)-半胱氨酸A的第一个对映选择性合成已通过22个步骤完成。新型催化,对映选择性的质子转移/呋喃迪尔斯-阿尔德(IMDAF)级联反应能够合成ACD三环核。利用还原性自由基环化级联反应构建B环,最终的操作以分子氧介导的γ-CH氧化,Stetter环化以接触环戊烯酮侧基以及高度化学选择性的内酰胺还原为天然产物目标。