Abstract
Reported herein is the total synthesis of (+)-ambiguine G, the first member of the chlorinated pentacyclic ambiguines to yield to chemical synthesis. The synthesis is accomplished through a convergent strategy that proceeds in 10 steps from (S)-carvone oxide. Pivotal to the concise route is the successful realization of a [4+3] cycloaddition that conjoins two easily synthesized components of the carbon framework of the natural product. Also featured in the synthesis is the efficient, diastereoselective construction of a key vinylated chloro ketone and the unprecedented, one-pot reduction–elimination–oxidation sequence that transforms an enone to an advanced hydroxylated-diene intermediate.
Highlights
We report the total synthesis of (+)-ambiguine G (8), the first member of the chlorinated pentacyclic ambiguines to yield to chemical synthesis
Our strategy to ambiguine G (8) is intimated in the retrosynthesis shown in Scheme 1 and is enabled by three key insights
Two-step synthesis of chloro ketone 17 in hand, we focused our attention on assembling the carbon framework of the natural product via the [4+3] cycloaddition reaction
Summary
Reported is the total synthesis of (+)-ambiguine G, the first member of the chlorinated pentacyclic ambiguines to yield to chemical synthesis.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have