Concise Synthesis of the Bryostatin A-Ring via Consecutive C−C Bond Forming Transfer Hydrogenations
作者:Yu Lu、Michael J. Krische
DOI:10.1021/ol901096d
日期:2009.7.16
Under the conditions of C−Cbondformingtransferhydrogenation, 1,3-propanediol 1 engages in double asymmetric carbonyl allylation to furnish the C2-symmetric diol 2. Double ozonolysis of 2 followed by TBS protection delivers aldehyde 3, which is subject to catalyst directed carbonyl reverse prenylation viatransferhydrogenation to deliver neopentyl alcohol 4 and, ultimately, the bryostatin A-ring
在C-C键形成转移氢化的条件下,1,3-丙二醇1参与双不对称羰基烯丙基化反应得到C 2对称二醇2。2 的双臭氧分解,然后是 TBS 保护提供醛3,醛3受到催化剂引导的羰基反向异戊二烯化,通过转移氢化提供新戊醇4,并最终提供苔藓抑素 A 环7。通过使用两个连续的 C-C 键形成转移氢化,埃文斯的苔藓抑素 A 环7的制备方法不到先前报道的一半。