A diastereo- and enantioselective totalsynthesis of diocollettines A with an unusual oxygen-containing tricyclic ring system has been achieved in 63% overall yield from commercially available 3-phenylpropanal via four steps. The key feature of the present synthesis is an exclusively diastereoselective cascade sequence composed of a trans-selective oxa-Michael addition of 1,3-dihydroxyacetone to a
Total Syntheses of (+)-Peniciketals A-B and (−)-Diocollettines A Exploiting a Photoisomerization/Cyclization Union Protocol
作者:Yifan Deng、Yike Zou、Chia-Ping H. Yang、K. N. Houk、Amos B. Smith
DOI:10.1021/acs.joc.1c01635
日期:2021.10.1
A late-stage photoisomerization/cyclization union tactic, in conjunction with Type I Anion Relay Chemistry (ARC), permits enantioselective total syntheses and then biological evaluation of (+)-peniciketals A and B. The photochemical protocol was further showcased by an efficient three-step construction of the architecturally complex polycyclic skeleton found in (−)-diocollettines A. The mechanism and
后期光异构化/环化联合策略与 I 型阴离子中继化学 (ARC) 相结合,允许对映选择性全合成,然后对 (+)-青酮 A 和 B 进行生物学评估。光化学协议进一步展示了有效的三个- 在 (-)-diocollettines A 中发现的结构复杂的多环骨架的一步构建。光化学协议的机制和非对映选择性也已通过实验和密度泛函理论计算进行了探索。