Synthesis of the Purported <i>ent</i>-Pochonin J Structure Featuring a Stereoselective Oxocarbenium Allylation
作者:Dionicio Martinez-Solorio、Kenneth A. Belmore、Michael P. Jennings
DOI:10.1021/jo200332d
日期:2011.5.20
The synthesis of the alleged natural product pochonin J is presented. Key steps of this convergent synthesis include a chemoselective Wacker oxidation, and an Evans' anti-reduction of the resulting ketone. Upon ozonolysis, this intermediate undergoes a 6-exo-trig cyclization to give a hemiketal intermediate, the key oxocarbenium precursor. The construction of the alpha-C-glycoside subunit is highlighted by a mismatched oxocarbenium cation formation/allylation sequence. An olefin metathesis afforded the 14-membered macrolactone, and final oxidation provided the "desired" compound that does not spectroscopically correlate to the initially described natural product.