Asymmetric Synthesis of 1-Aza-4-deoxypicropodophyllotoxin
摘要:
In our search for new easily accessible analogues based on the natural product podophyllotoxin, we synthesized 1-aza-4-deoxypicropodophyllotoxin in good overall yield and excellent enantioselectivity. The synthesis was centered around a direct asymmetric Mannich reaction using D-proline as the key step for introduction of the chiral centres. Our synthesis of 1-aza-4-deoxypodophyllotoxin was hindered through the increased instability towards epimerization of the C2 position. We did, however, synthesized a new scaffold based on the opened lactone analogue.
Asymmetric Synthesis of 1-Aza-4-deoxypicropodophyllotoxin
摘要:
In our search for new easily accessible analogues based on the natural product podophyllotoxin, we synthesized 1-aza-4-deoxypicropodophyllotoxin in good overall yield and excellent enantioselectivity. The synthesis was centered around a direct asymmetric Mannich reaction using D-proline as the key step for introduction of the chiral centres. Our synthesis of 1-aza-4-deoxypodophyllotoxin was hindered through the increased instability towards epimerization of the C2 position. We did, however, synthesized a new scaffold based on the opened lactone analogue.
[EN] 1,4-DISUBSTITUTED PIPERIDINE DERIVATIVES AND THEIR USE AS 11-BETAHSD1 INHIBITORS<br/>[FR] DERIVES DE PIPERIDINE 1,4 DISUBSTITUEE ET LEUR UTILISATION EN TANT QU'INHIBITEURS DE 11-BETAHSD1
申请人:ASTRAZENECA AB
公开号:WO2004033427A1
公开(公告)日:2004-04-22
The use of a compound of formula (I) in the manufacture of a medicament for use in the inhibition of 11βHSD1 is described.
The intramolecular azomethine ylide cycloaddition of α‐trifluoromethyl styrenes gives rise to the formation of polycyclic fluorinated pyrrolidines. The process takes place in moderate yields and complete diastereoselectivity with the simultaneous generation of up to three stereocenters. Initial attempts of the asymmetric version have been also carried out.
Intramolecular Nitrone Cycloaddition of α-(Trifluoromethyl)styrenes. Role of the CF<sub>3</sub> Group in the Regioselectivity
作者:Fernando Rabasa-Alcañiz、Amparo Asensio、María Sánchez-Roselló、Marcos Escolano、Carlos del Pozo、Santos Fustero
DOI:10.1021/acs.joc.6b02880
日期:2017.3.3
The intramolecular 1,3-dipolar cycloaddition of ortho-substituted 1,1,1-trifluoromethylstyrene-derived nitrones is described. Tricyclic fused isoxazolidines were obtained as major or exclusive products, in contrast to the case for nonfluorinated substrates, which rendered the bridged derivatives. This change in the regioselectivity was attributed to the electronic and, particularly, steric requirements
1,4-disubstituted piperidine derivatives and their use as 11,betahsd1 inhibitors
申请人:Barton John Peter
公开号:US20050256159A1
公开(公告)日:2005-11-17
A method for inhibiting 11βHSD1 by administering a compound of formula (I) is described, wherein A, X, Y, R
1
, R
12
, n, q, and m are as described in the specification. Novel compounds and methods employing them are also described and claimed.