献给教授迪特尔·恩德斯在他70之际个生日。 抽象的 我们描述了murrayafoline-B和七个咔唑-1,4-醌生物碱的总合成。钯(II)催化的氧化环化反应可用于构建咔唑骨架。吡喃环化和氧化提供吡喃醌-A,-B和-C。吡喃并[3,2- a ]咔唑前体的DIBAL-H促进的还原开环会导致异戊烯基和Geranylated咔唑-1,4-醌生物碱murrayaquinone-B,-C,-D和-E,并导致murrayafoline- B. 我们描述了murrayafoline-B和七个咔唑-1,4-醌生物碱的总合成。钯(II)催化的氧化环化反应可用于构建咔唑骨架。吡喃环化和氧化提供吡喃醌-A,-B和-C。吡喃并[3,2- a ]咔唑前体的DIBAL-H促进的还原开环会导致异戊烯基和Geranylated咔唑-1,4-醌生物碱murrayaquinone-B,-C,-D和-E,并导致murrayafoline-
Synthesis of carbazoloquinone natural products ‘on-water’
作者:P. Norcott、C. S. P. McErlean
DOI:10.1039/c5ob00852b
日期:——
total synthesis of a number of carbazolo-1,4-quinone natural products using on-water chemistry is described. A recently developed domino ‘in-water, on-water’ process is employed to rapidly and efficiently generate königinequinone A, which subsequently enables access to murrayaquinones B, C, D and E, and pyrayaquinones B and C, via a remarkablyfacile on-water catalysed Claisen rearrangement.
Thirteen carbazole alkaloids were isolated from Murraya euchrestifolia HAYATA (Rutaceae) collected in Taiwan. Four of them are novel carbazolequinones [murrayaquinone-A (7), -B (8), -C (9), and -D (10)], isolated for the first time from natural sources. Three of others are new alkaloids having the normal carbazole nucleus [murrayafoline-A (1), -B (2), and (+)-murrayazoline (11)]. These structures were elucidated from spectral data and chemical transformations.
the total synthesis of murrayafoline-B and seven carbazole-1,4-quinone alkaloids. A palladium(II)-catalyzed oxidative cyclization is used to construct the carbazole skeleton. Pyran annulation and oxidation provide pyrayaquinone-A, -B, and -C. DIBAL-H-promoted reductiveringopening of pyrano[3,2-a]carbazole precursors leads to the prenylated and geranylated carbazole-1,4-quinone alkaloids murrayaquinone-B
献给教授迪特尔·恩德斯在他70之际个生日。 抽象的 我们描述了murrayafoline-B和七个咔唑-1,4-醌生物碱的总合成。钯(II)催化的氧化环化反应可用于构建咔唑骨架。吡喃环化和氧化提供吡喃醌-A,-B和-C。吡喃并[3,2- a ]咔唑前体的DIBAL-H促进的还原开环会导致异戊烯基和Geranylated咔唑-1,4-醌生物碱murrayaquinone-B,-C,-D和-E,并导致murrayafoline- B. 我们描述了murrayafoline-B和七个咔唑-1,4-醌生物碱的总合成。钯(II)催化的氧化环化反应可用于构建咔唑骨架。吡喃环化和氧化提供吡喃醌-A,-B和-C。吡喃并[3,2- a ]咔唑前体的DIBAL-H促进的还原开环会导致异戊烯基和Geranylated咔唑-1,4-醌生物碱murrayaquinone-B,-C,-D和-E,并导致murrayafoline-