期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 143, 期 40, 页码 16394-16400出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.1c08756
关键词
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资金
- National Science Foundation [NSF-1566402]
This paper reports a new total synthesis strategy utilizing the transition metal-catalyzed [2 + 2 + 2] cycloisomerization reaction, achieving the first total synthesis of a member from the Veratrum alkaloids family.
Chemical transformations that rapidly and efficiently construct a high level of molecular complexity in a single step are perhaps the most valuable in total synthesis. Among such transformations is the transition metal catalyzed [2 + 2 + 2] cycloisomerization reaction, which forges three new C-C bonds and one or more rings in a single synthetic operation. We report here a strategy that leverages this transformation to open de novo access to the Veratrum family of alkaloids. The highly convergent approach described herein includes (i) the enantioselective synthesis of a diyne fragment containing the steroidal A/B rings, (ii) the asymmetric synthesis of a propargyl-substituted piperidinone (F ring) unit, (iii) the high-yielding union of the above fragments, and (iv) the intramolecular [2 + 2 + 2] cycloisomerization reaction of the resulting carbon framework to construct in a single step the remaining three rings (C/D/E) of the hexacyclic cevanine skeleton. Efficient late-stage maneuvers culminated in the first total synthesis of heilonine (1), achieved in 21 steps starting from ethyl vinyl ketone.
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