On October 26, 2007, Hong, Bor-Cherng; Wu, Ming-Fun; Tseng, Hsing-Chang; Huang, Guo-Fong; Su, Cheng-Feng; Liao, Ju-Hsiou published an article.HPLC of Formula: 79815-20-6 The title of the article was Organocatalytic asymmetric robinson annulation of α,β-unsaturated aldehydes: applications to the total synthesis of (+)-palitantin. And the article contained the following:
Cyclohexadienecarboxaldehydes such as I (R = H, AcO; R1 = H, Me; R2 = AcOCH2, Ph, 2-O2NC6H4, Me, Et, Me2CH) are prepared by enantioselective Robinson annulation reactions of α,β-unsaturated aldehydes (E)-RCH2C(R1):CHCHO [R = H, Me, Et, Me2CH, Ph, 2-O2NC6H4, AcO; R1 = H, Me; RR1 = (CH2)4] in the presence of organic amines such as L-proline or α,α-diphenyl-L-prolinyl and α,α-bis(2-naphthyl)-L-prolinyl trimethylsilyl ethers and in the presence or absence of organic acids or bases. I (R = AcO; R1 = H; R2 = AcOCH2), formed by the stereoselective self-condensation of (E)- or (Z)-AcOCH2CH:CHCHO in the presence of L-proline and triethylamine, is converted in nine steps to (+)-palitantin II. The structure of I (R = H; R1 = Me; R2 = 2-O2NC6H4) is determined by x-ray crystallog.; the absolute configurations of I (R = R1 = H; R2 = Me) and of I (R = H; R1 = Me; R2 = Ph) are determined by their conversion to cyclohexadienecarboxylates of known absolute configuration. The experimental process involved the reaction of H-Idc-OH(cas: 79815-20-6).HPLC of Formula: 79815-20-6
The Article related to cyclohexadienecarboxaldehyde stereoselective enantioselective preparation, palitantin stereoselective enantioselective preparation, organocatalytic stereoselective enantioselective robinson annulation unsaturated aldehyde, organic amine catalyst stereoselective enantioselective robinson annulation unsaturated aldehyde and other aspects.HPLC of Formula: 79815-20-6
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Indole alkaloid derivatives as building blocks of natural products from Bacillus thuringiensis and Bacillus velezensis and their antibacterial and antifungal activity study,
Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles