(-)-Mersicarpine、(-)-Scholarisine G、(+)-Melodinine E、(-)-Leuconoxine、(-)-Leuconolam、(-)-Leuconodine A、(+)-Leuconodine F 和(−)-Leuconodine C:Scholarisine G 和 Leuconodines A 和 C 的自诱导非对映异构非等时性 (SIDA) 现象
摘要:
报道了来自常见环己烯酮衍生物 (S)-18 的标题天然产物的对映选择性全合成。(S)-18 的臭氧分解提供了稳定的二酮酯 (R)-17,随后将其转化为两种骨架不同的天然产物,即具有 [6.5.6.7] 稠合四环系统的 (-)-mersicarpine (8) 和(-)-scholarisine G (9) 分别具有 [6.5.6.6.5] 融合的五环骨架。通过利用 (+)-melodinine E (6) 向 N-acyliminium 离子 7 的轻松转化,将羟基选择性地引入到 C6、C7、C10 和中央 C21 位置,实现了环化后的多样化。 diazafenestrane 系统,导致 (-)-leuconodine A (11)、(+)-leuconodine F (12)、(-)-scholarisine G (9)、(-)-leuconodine C (13) 和骨骼上不同的 (-
(-)-Mersicarpine、(-)-Scholarisine G、(+)-Melodinine E、(-)-Leuconoxine、(-)-Leuconolam、(-)-Leuconodine A、(+)-Leuconodine F 和(−)-Leuconodine C:Scholarisine G 和 Leuconodines A 和 C 的自诱导非对映异构非等时性 (SIDA) 现象
摘要:
报道了来自常见环己烯酮衍生物 (S)-18 的标题天然产物的对映选择性全合成。(S)-18 的臭氧分解提供了稳定的二酮酯 (R)-17,随后将其转化为两种骨架不同的天然产物,即具有 [6.5.6.7] 稠合四环系统的 (-)-mersicarpine (8) 和(-)-scholarisine G (9) 分别具有 [6.5.6.6.5] 融合的五环骨架。通过利用 (+)-melodinine E (6) 向 N-acyliminium 离子 7 的轻松转化,将羟基选择性地引入到 C6、C7、C10 和中央 C21 位置,实现了环化后的多样化。 diazafenestrane 系统,导致 (-)-leuconodine A (11)、(+)-leuconodine F (12)、(-)-scholarisine G (9)、(-)-leuconodine C (13) 和骨骼上不同的 (-
Biocatalytic Conversion of Cyclic Ketones Bearing α-Quaternary Stereocenters into Lactones in an Enantioselective Radical Approach to Medium-Sized Carbocycles
作者:Charlotte Morrill、Chantel Jensen、Xavier Just-Baringo、Gideon Grogan、Nicholas J. Turner、David J. Procter
DOI:10.1002/anie.201800121
日期:2018.3.26
Cyclic ketones bearing α‐quaternary stereocenters underwent efficient kinetic resolution using cyclohexanonemonooxygenase (CHMO) from Acinetobacter calcoaceticus. Lactones possessing tetrasubstituted stereocenters were obtained with high enantioselectivity (up to >99 % ee) and complete chemoselectivity. Preparative‐scale biotransformations were exploited in conjunction with a SmI2‐mediated cyclization
Cycloalkanoindoles. 1. Syntheses and antiinflammatory actions of some acidic tetrahydrocarbazoles, cyclopentindoles, and cycloheptindoles
作者:Andre A. Asselin、Leslie G. Humber、Thomas A. Dobson、Jacqueline Komlossy、Rene R. Martel
DOI:10.1021/jm00228a010
日期:1976.6
A novel series of acidic cycloalkanoindoles comprising tetrahydrocarbazole-, cyclopentindole-, and cycloheptindole-1-acetic acids has been synthesized via the Fischer indolization between a phenylhydrazine and a 1-alkyl-2-oxocycloalkaneacetic acid ester. These compounds were evaluated, orally, for their capacities to decrease estabished adjuvant arthritis in rats. The most active compound of the series was 1-ethyl-8-n-propyl-1,2,3,4-tetrahydrocarbazole-1-acetic acid (AY-24 873),which had an ED50 of 1.1 +/- 0.2 mg/kg. AY-24 873 was also studied orally in rats for its effect on the acute inflammatory response in the carrageenin paw edema test. It was found that AY-24 873 was about ten times more active against the chromic than against the acute models of inflammation used.
Nedenskov et al., Acta Chemica Scandinavica (1947), 1958, vol. 12, p. 1405,1409
作者:Nedenskov et al.
DOI:——
日期:——
GOYAL S. C.; GUPTA S. M., INDIAN J. CHEM., 1977, B 15, NO 8, 758-760