Enantioselective Total Synthesis of (+)-Psiguadial B
作者:Lauren M. Chapman、Jordan C. Beck、Linglin Wu、Sarah E. Reisman
DOI:10.1021/jacs.6b07229
日期:2016.8.10
The firstenantioselective total synthesis of the cytotoxic natural product (+)-psiguadial B is reported. Key features of the synthesis include (1) the enantioselective preparation of a key cyclobutane intermediate by a tandem Wolff rearrangement/asymmetric ketene addition, (2) a directed C(sp(3))-H alkenylation reaction to strategically forge the C1-C2 bond, and (3) a ring-closing metathesis to build
报道了细胞毒性天然产物 (+)-psiguadial B 的第一个对映选择性全合成。该合成的关键特征包括 (1) 通过串联沃尔夫重排/不对称烯酮加成对关键环丁烷中间体进行对映选择性制备,(2) 定向 C(sp(3))-H 烯基化反应以战略性地锻造 C1-C2键,和(3)闭环复分解,以构建桥接双环[4.3.1]癸烷萜烯骨架。
Photolysis of α-diazocyclopentanones: ring contraction to functionalised cyclobutanes and synthesis of precursors to grandisol and fragranol
作者:Ujjal K. Banerjes、R.V. Venkateswaran
DOI:10.1016/s0040-4039(00)81426-4
日期:——
Photolytic Wolff rearrangement of α-diazocyclopentanones (3a-c) in methanol leads to the cyclobutane carboxylates (4a-d).