1246513-75-6Relevant academic research and scientific papers
Total synthesis and absolute stereochemical assignment of (-)-communesin F
Zuo, Zhiwei,Xie, Weiqing,Ma, Dawei
supporting information; experimental part, p. 13226 - 13228 (2010/11/05)
A concise asymmetric total synthesis of (-)-communesin F (～6% overall yield in the longest linear sequence of 19 steps) is described. It features an unprecedented intramolecular oxidative coupling strategy for the elaboration of the requisite spiro-fused indoline moiety. Other notable elements are the use of TBS-protected (S)-phenylglycinol as a chiral auxiliary to induce the asymmetric formation of the spiro-fused indoline part, the mesylate-mediated formation of its G ring, and the introduction of the A ring at the final stage via intramolecular Staudinger reaction. This intramolecular Staudinger reaction proceeded smoothly at 80 °C, providing an additional example illustrating that twisted amides are more reactive than simple amides. Along with the total synthesis, we were able to assign the absolute configuration of natural communesin F as 6R,7R,8R,9S,11R.
