Catalytic enantioselective Grignard Nozaki–Hiyama methallylation from the alcohol oxidation level: chloride compensates for π-complex instability
作者:Abbas Hassan、Ian A. Townsend、Michael J. Krische
DOI:10.1039/c1cc14392a
日期:——
Methallyl chloride serves as an efficient allyl donor in highly enantioselective Grignard Nozaki-Hiyama methallylations from the alcohol or aldehyde oxidation level via iridium catalyzed transfer hydrogenation. Under identical conditions, methallyl acetate does not react efficiently. Double methallylation of 1,3-propanediol provides the C(2)-symmetric adduct as a single enantiomer, as determined by
Enantioselective Synthesis of (−)-Sclerophytin A by a Stereoconvergent Epoxide Hydrolysis
作者:Bin Wang、Armando P. Ramirez、Justin J. Slade、James P. Morken
DOI:10.1021/ja108185z
日期:2010.11.24
The cytotoxic natural product (-)-sclerophytin A was constructed in 13 steps from geranial. Highlights from the synthesis are a stereoselective Oshima-Utimoto reaction, a Shibata-Baba indium-promoted radical cyclization, and a novel stereoconvergent epoxide hydrolysis.
细胞毒性天然产物 (-)-sclerophytin A 是从天竺葵中分 13 个步骤构建的。合成的亮点是立体选择性的 Oshima-Utimoto 反应、Shibata-Baba 铟促进的自由基环化和新型立体会聚环氧化物水解。