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Total Synthesis and Absolute Stereochemical Assignment of (−)-Communesin F

2010; American Chemical Society; Volume: 132; Issue: 38 Linguagem: Inglês

10.1021/ja106739g

1943-2984

Zhiwei Zuo, Weiqing Xie, Dawei Ma,

Bioactive natural compounds

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.